Care guide, husbandry, breeding, disease, sourcing, and tankmate intelligence on Hard Tube Worm - written by the Fast Aquatics editorial team and cross-verified against vendor records on the live marketplace.
Hard Tube Worm (Protula bispiralis) is a marine invertebrate kept by aquarists for reef-tank cleanup, biological control of pests, or aesthetic display. Suitable for keepers with 6-12 months of experience and stable water chemistry.
Where Hard Tube Worm comes from
Hard Tube Worm (Protula bispiralis) 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 Hard Tube Worm 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.
Hard Tube Worm tank size and setup
Hard Tube Worm requires a minimum of 30 gallons for healthy adults. The minimum is based on the species' adult size (8 inch tube), territorial range, and behavior pattern. Most Hard Tube Worm 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 Hard Tube Worm 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 Hard Tube Worm depends on.
Hard Tube Worm 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)
Hard Tube Worm is sensitive to copper - never medicate the display tank with copper if Hard Tube Worm is present. Stable parameters beat perfect parameters.
What Hard Tube Worm eats
Hard Tube Worm 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 Hard Tube Worm appropriately for its size + activity level. Overfeeding is the #1 cause of water-quality crashes in tanks of all sizes.
Hard Tube Worm tankmates and compatibility
Hard Tube Worm 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 Hard Tube Worm can share a tank but compete for food.
Browse care guides for tankmate-compatibility tables for Hard Tube Worm and similar species.
Hard Tube Worm adult size and lifespan
Hard Tube Worm reaches 8 inch tube at adulthood with a captive lifespan of 5-10 years with proper care. Many marine inverts molt periodically; provide adequate calcium and a stable parameter regime to support healthy molts.
Can you breed Hard Tube Worm?
Hard Tube Worm 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 Hard Tube Worm diseases and problems
Hard Tube Worm is sensitive to copper, ammonia spikes, low oxygen, and rapid parameter swings. NEVER use copper medications in a tank with Hard Tube Worm. Symptoms of stress: reclusive behavior, color loss, refusal to feed, abnormal molting (incomplete or stuck molts). Most Hard Tube Worm deaths trace back to acclimation shock or parameter mismatch - drip-acclimate over 45-60 minutes when adding to a new tank.
Where to buy Hard Tube Worm online
Hard Tube Worm is sold at LFS (local fish stores), online retailers, and direct from breeders/wholesalers. Pricing varies widely by source, size, and quality:
Browse live Hard Tube Worm 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.
Hard Tube Worm FAQ
How big does Hard Tube Worm get?
8 inch tube at adulthood within 12-24 months.
How long does Hard Tube Worm live?
5-10 years with proper care.
What is the minimum tank/pond size?
30 gallons, with larger systems strongly recommended.
Is Hard Tube Worm hard to keep?
Hard Tube Worm is rated intermediate difficulty.
What does Hard Tube Worm eat?
Hard Tube Worm is a plankton filter feeder; appropriate diet matches its natural feeding pattern.
Hard Tube Worm taxonomy and care recommendations cross-checked against the following authoritative references and our internal vendor + breeder database.