Care guide, husbandry, breeding, disease, sourcing, and tankmate intelligence on Blue Tunicate - written by the Fast Aquatics editorial team and cross-verified against vendor records on the live marketplace.
Blue Tunicate (Rhopalaea spp.) is a marine invertebrate kept by aquarists for reef-tank cleanup, biological control of pests, or aesthetic display. Demanding requirements make this species best for keepers with established mature systems and proven track records.
Where Blue Tunicate comes from
Blue Tunicate (Rhopalaea spp.) is native to Indo-Pacific reef ecosystems, with wild populations distributed across coral reefs, sandy lagoons, and rocky tide pools. Captive specimens are typically wild-collected; some species are starting to be aquacultured but most Blue Tunicate sold today still comes from wild reef collection. Sustainable sourcing matters - look for vendors who can verify their collection practices, and consider aquacultured alternatives when available.
Blue Tunicate tank size and setup
Blue Tunicate requires a minimum of 55 gallons for healthy adults. The minimum is based on the species' adult size (2 inches), territorial range, and behavior pattern. Most Blue Tunicate sold at small juvenile size will reach full adult size within 12-24 months and the system must be sized to the adult, not the juvenile.
For a Blue Tunicate setup: mature reef tank with stable parameters, live rock for cover, sandbed substrate (1-2"), reef-grade lighting if photosynthetic, and a fully-cycled biological filter at least 6 weeks old. Newly-cycled tanks under 6 weeks crash the parameters that Blue Tunicate depends on.
Blue Tunicate requires standard reef parameters held tightly stable: Temperature: 76-80°F (24-27°C) Specific gravity: 1.025 (refractometer-measured) pH: 8.1-8.4 Alkalinity: 8-9 dKH Calcium: 420-450 ppm Magnesium: 1300-1400 ppm Ammonia + nitrite: Both 0 ppm Nitrate: Under 10 ppm Copper: 0 (lethal to invertebrates)
Blue Tunicate is sensitive to copper - never medicate the display tank with copper if Blue Tunicate is present. Stable parameters beat perfect parameters.
What Blue Tunicate eats
Blue Tunicate is a plankton filter feeder. Filter-feeds on suspended plankton and dissolved organics. Target-feed live phytoplankton, rotifers, or commercial reef foods (Reef Roids, Coral Frenzy) 2-3x weekly to ensure adequate nutrition. Feed Blue Tunicate appropriately for its size + activity level. Overfeeding is the #1 cause of water-quality crashes in tanks of all sizes.
Blue Tunicate tankmates and compatibility
Blue Tunicate is generally peaceful and compatible with most reef community species. Avoid keeping with predatory fish that view inverts as food: large wrasses (especially halichoeres + thalassoma), triggerfish, pufferfish, and certain large angelfish. Multiple Blue Tunicate can share a tank but compete for food.
Browse care guides for tankmate-compatibility tables for Blue Tunicate and similar species.
Blue Tunicate adult size and lifespan
Blue Tunicate reaches 2 inches at adulthood with a captive lifespan of 1-3 years with proper care. Many marine inverts molt periodically; provide adequate calcium and a stable parameter regime to support healthy molts.
Can you breed Blue Tunicate?
Blue Tunicate breeding in captivity ranges from straightforward (some shrimp, snails) to nearly impossible (most starfish, urchins) due to pelagic larval requirements. Captive-bred specimens are increasingly available from sustainable aquaculture facilities; check with vendors before assuming wild-caught origin.
Common Blue Tunicate diseases and problems
Blue Tunicate is sensitive to copper, ammonia spikes, low oxygen, and rapid parameter swings. NEVER use copper medications in a tank with Blue Tunicate. Symptoms of stress: reclusive behavior, color loss, refusal to feed, abnormal molting (incomplete or stuck molts). Most Blue Tunicate deaths trace back to acclimation shock or parameter mismatch - drip-acclimate over 45-60 minutes when adding to a new tank.
Where to buy Blue Tunicate online
Blue Tunicate is sold at LFS (local fish stores), online retailers, and direct from breeders/wholesalers. Pricing varies widely by source, size, and quality:
Browse live Blue Tunicate from vetted Fast Aquatics vendors with carrier-tracked overnight shipping (FedEx Priority + UPS Next Day), climate-aware hold logic, and a 4-hour DOA window with photo-evidence claims. Captive-bred or aquacultured specimens cost more upfront but arrive healthier and integrate faster.
Blue Tunicate FAQ
How big does Blue Tunicate get?
2 inches at adulthood within 12-24 months.
How long does Blue Tunicate live?
1-3 years with proper care.
What is the minimum tank/pond size?
55 gallons, with larger systems strongly recommended.
Is Blue Tunicate hard to keep?
Blue Tunicate is rated expert difficulty.
What does Blue Tunicate eat?
Blue Tunicate is a plankton filter feeder; appropriate diet matches its natural feeding pattern.
Blue Tunicate taxonomy and care recommendations cross-checked against the following authoritative references and our internal vendor + breeder database.