Coralline algae must be physically introduced into a marine aquarium because it does not appear spontaneously. There are two reliable methods of introduction, each with different success rates and biological constraints. The first method involves stocking snails or hermit crabs whose shells already carry coralline algae from a fish store or supplier tank. This method has significant limitations. A given snail or hermit shell typically carries only one or two species of coralline; those species are adapted to the specific lighting, temperature, and water chemistry of the location where the snail originated, and they may not establish in a tank with different parameters. Many coralline species also release reproductive spores only during specific seasonal windows, so a snail collected outside that window will not seed new growth until that specific season comes again, even if its shell carries adult colonies of coralline. Snails sourced from non-tropical or deep-water environments will not produce coralline that can survive in a tropical reef tank. The second method, introducing coralline algae in spore form, is faster and far more reliable. ARC Reef Coralline Algae in a Bottle delivers up to 13 distinct species when Purple Helix and Pink Fusion are combined, which dramatically increases the probability that several species will find ideal conditions in any given tank. For seeding new coralline algae growth, no method is faster than introducing multiple species in spore form.

All coralline algae orders ship from our Miami Beach facility Monday through Saturday, six days a week. Orders are processed and shipped within one business day of being placed. Every shipment is guaranteed to arrive alive, with packaging designed to keep spores fresh in transit.

Dose one bottle per 50 gallons of total system water volume, including sump and refugium. For nano tanks of 9 gallons or less, use one-half to three-quarters of a bottle. For tanks between 10 and 50 gallons, use one full bottle. For larger systems, add one additional bottle for every 50 gallons above the first 50. A 100-gallon system uses two bottles, a 150-gallon system uses three, and so on. Overdosing is not possible. The product contains only live coralline algae spores and beneficial nitrifying bacteria, with no calcium, magnesium, alkalinity, or trace element additives, so dosing does not alter water chemistry. Tanks dosed below the recommended volume will still develop coralline algae over time, but visible growth will take significantly longer to appear.

Most aquariums show visible coralline algae spots within 8 to 10 weeks, though some hobbyists report growth in as little as 2 to 4 weeks. In ARC Reef’s controlled testing, 84% of tanks showed growth within 8 to 10 weeks, and nearly 98.4% showed growth by the 4-month mark. The 8 to 10 week average reflects the time required for spores to settle on hard surfaces and uptake the calcium and magnesium needed to begin growth. Coralline spores behave similarly to mushroom mycelium, with which they share an evolutionary lineage: they remain dormant until environmental conditions align, then appear suddenly across the tank, often overnight. Several variables affect timing. Tank temperature should be 78 to 81 degrees Fahrenheit; temperatures outside this range delay growth by several weeks. pH should be between 8.1 and 8.4. At a pH of 7.8 or below, growth slows substantially. Stable parameters matter more than perfect ones. Swings in alkalinity, pH, ammonia, or salinity will slow coralline development, and large swings can kill the spores entirely. Lighting intensity also affects results, with medium intensity producing the fastest growth and high-intensity SPS lighting producing the slowest, since not every species in the bottle thrives under intense light. Adequate water flow is required so spores can pull calcium and magnesium from the water column. Salt mix selection matters because pH varies between brands, so water changes should not exceed 10% at one time until coralline is established. Test water at least weekly. In approximately 95% of cases where coralline fails to grow, water chemistry is out of range, typically pH or alkalinity running too low. Phosphate also slows growth; GFO, Phosban, or Phosguard can keep phosphate levels in check.

Yes, and using both products together is recommended. Purple Helix contains 7 species of coralline algae, and Pink Fusion contains 6, for a combined total of 13 distinct species when dosed together in the same tank. Each species has its own preferences for lighting intensity, temperature, water flow, and water chemistry, so introducing the full range increases the likelihood that several species will find ideal conditions and establish quickly. The result is greater biodiversity, faster overall coverage, and a wider color palette across rock and aquarium surfaces, ranging from deep purple and magenta to soft pink, lavender, and red. The two products do not conflict or interfere with each other.

Live rock is temporarily unavailable and is not being shipped at this time. When live rock shipping resumes, orders are processed within 1 to 2 business days of being received and shipped according to the selected shipping method. Shipping days are scheduled to ensure live rock does not sit in transit over weekends, which would compromise the health of the bacteria, coralline algae, and other organisms living on the rock.

1. 1. 1. UPS Ground: – Ships Monday and Tuesday.
      2. 3 Day Select: – Ships Monday through Wednesday.
      3. 2nd Day Air: – Ships Monday through Thursday.
      4. Next Day Air:– Ships Monday through Thursday.
      5. Dry Rock and Live Sand: – Ship Monday through Saturday.

A tracking email is sent once the order leaves the facility. Because live rock is harvested fresh for each order from offshore aquaculture sites in Florida, occasional weather-related delays of several days can occur when ocean conditions do not permit safe harvest. This is normal for any aquacultured live rock product and is preferable to shipping rock that has died in transit.

ARC Reef live rock does not require curing in most cases. Curing is the process used to remove die-off (decomposed organic matter from organisms that did not survive transit) from live rock that has been out of water for extended periods. It is most commonly required for imported rock from Fiji, Indonesia, and other distant sources where transit can exceed a week and significant die-off is unavoidable. ARC Reef live rock is harvested from offshore aquaculture sites in Florida, kept fully submerged during transport from the harvest site to the Miami aquaculture facility, and held in large high-flow holding tanks until orders ship. This continuous submersion preserves the bacteria, coralline algae, sponges, and other beneficial organisms living on the rock. To preserve this advantage during final delivery, select a shipping method with a transit time of under 4 days. Each shipping package includes water and a saturated towel to maintain humidity and minimize stress. While any live rock shipment introduces some transit stress, intertidal rock evolved to tolerate periodic air exposure during low tide, which makes it more resilient than nontropical organisms. In most cases, ARC Reef live rock can be added directly to a cycled aquarium without a separate curing period.

Several factors determine whether live rock will perform well in a home aquarium. When sourcing from a local fish store or private seller, inspect the source tank for hair algae, Aiptasia anemones, and Majano anemones. Any of these will hitchhike on rock and become persistent pests in the destination tank. Test the source water for phosphates if possible, because porous live rock absorbs phosphate over time and can leach it into a new system, fueling nuisance algae. Ask whether the source tank has ever been treated with copper-based medications. Copper binds permanently to live rock and makes the rock unsuitable for any tank intended to house corals or sensitive invertebrates. Smell is a useful field test for die-off. Healthy live rock smells like the ocean, slightly sweet, or like nothing at all. A rotten or sulfurous smell indicates dead organic matter and means the rock will require curing before use. When buying online, choose established suppliers with verifiable business credentials and customer history rather than unknown sellers. Consider the source of the rock itself: wild-collected rock from countries like Fiji and Indonesia involves removing material from existing coral reefs, while aquacultured rock is grown in controlled environments and does not damage natural reef systems. Both options work biologically, but they differ significantly in environmental impact.

ARC Reef live rock is covered by an unconditional lifetime warranty. The warranty covers the full replacement of any live rock from a previous order, regardless of circumstances, including accidental tank poisoning, chemical contamination, equipment failure, or a full tank crash. The customer pays only the shipping cost on the replacement order. To request a warranty replacement, please email info@ARCreef.com with the original order details, and we will process and ship a replacement the next business day. The warranty applies to ARC Reef aquacultured live rock products and does not cover dry rock, live sand, or coralline algae products, which have separate return and replacement policies. This warranty exists because aquacultured live rock is replaceable in a way that wild-collected reef material is not, allowing ARC Reef to absorb replacement costs that other producers cannot.

ARC Reef operates under three regulatory licenses governing marine aquaculture in the United States. Atlantic Reef Conservation LLC holds a Florida Department of Agriculture Aquaculture Product Certificate (AQ0223588), a National Oceanic and Atmospheric Administration federal permit (AQU-069), and a Florida Fish and Wildlife Conservation Commission Wholesale Dealer License (WD-190448). Together, these licenses authorize the cultivation, holding, and commercial sale of aquacultured marine products, including live rock, coralline algae, dry rock, and live sand. All ARC Reef products are 100% aquacultured in Florida and the United States, with no imported or wild-harvested material in the product line. Aquacultured live rock differs from wild-collected rock in that it is grown in controlled environments and offshore aquaculture sites rather than removed from existing coral reefs. Wild collection of reef material is a documented contributor to habitat loss in source countries such as Fiji and Indonesia. Since 2016, ARC Reef has cultivated over 43,500 square feet of new offshore coral reef habitat in Florida waters and planted over 200,000 pounds of reef material as part of ongoing reef restoration work.

ARC Reef offers four return and replacement protections, organized by product type and claim circumstance. Live biological products (coralline algae, live aquaculture isolates) are covered by a 24-hour Biological Transit Guarantee. Customers who report a dead-on-arrival product within one day of delivery receive a full replacement or refund, and ARC Reef covers all return shipping costs on validated claims. Coralline algae products are also covered by an unconditional lifetime warranty against propagation failure when dosed correctly into water within the published parameter ranges. There is no time limit on the original purchase date. ARC Reef has honored claims on orders placed nine years prior. Non-biological dry goods, including Reef Stacker dry rock kits and acrylic rods, are covered by a 30-day return window for unused product, with no restocking fee. Items damaged in transit by the carrier are covered by a 24-hour damage replacement protocol with free return shipping. Full policy details, including documentation requirements and return shipping responsibilities, are available on the ARC Reef Return Policy page.