Care guide, husbandry, breeding, disease, sourcing, and tankmate intelligence on Donkey Dung Cucumber - written by the Fast Aquatics editorial team and cross-verified against vendor records on the live marketplace.
Donkey Dung Cucumber (Holothuria mexicana) 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 Donkey Dung Cucumber comes from
Donkey Dung Cucumber (Holothuria mexicana) 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 Donkey Dung Cucumber 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.
Donkey Dung Cucumber tank size and setup
Donkey Dung Cucumber requires a minimum of 75 gallons for healthy adults. The minimum is based on the species' adult size (18 inches), territorial range, and behavior pattern. Most Donkey Dung Cucumber 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 Donkey Dung Cucumber 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 Donkey Dung Cucumber depends on.
Donkey Dung Cucumber 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)
Donkey Dung Cucumber is sensitive to copper - never medicate the display tank with copper if Donkey Dung Cucumber is present. Stable parameters beat perfect parameters.
What Donkey Dung Cucumber eats
Donkey Dung Cucumber is a detritivore. Eats uneaten food, fish waste, and biofilm. Generally finds enough food in a stocked tank without supplemental feeding. If population thins, drop in algae wafers or sinking pellets weekly. Feed Donkey Dung Cucumber appropriately for its size + activity level. Overfeeding is the #1 cause of water-quality crashes in tanks of all sizes.
Donkey Dung Cucumber tankmates and compatibility
Donkey Dung Cucumber 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 Donkey Dung Cucumber can share a tank but compete for food.
Browse care guides for tankmate-compatibility tables for Donkey Dung Cucumber and similar species.
Donkey Dung Cucumber adult size and lifespan
Donkey Dung Cucumber reaches 18 inches 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 Donkey Dung Cucumber?
Donkey Dung Cucumber 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 Donkey Dung Cucumber diseases and problems
Donkey Dung Cucumber is sensitive to copper, ammonia spikes, low oxygen, and rapid parameter swings. NEVER use copper medications in a tank with Donkey Dung Cucumber. Symptoms of stress: reclusive behavior, color loss, refusal to feed, abnormal molting (incomplete or stuck molts). Most Donkey Dung Cucumber deaths trace back to acclimation shock or parameter mismatch - drip-acclimate over 45-60 minutes when adding to a new tank.
Where to buy Donkey Dung Cucumber online
Donkey Dung Cucumber is sold at LFS (local fish stores), online retailers, and direct from breeders/wholesalers. Pricing varies widely by source, size, and quality:
Browse live Donkey Dung Cucumber 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.
Donkey Dung Cucumber FAQ
How big does Donkey Dung Cucumber get?
18 inches at adulthood within 12-24 months.
How long does Donkey Dung Cucumber live?
5-10 years with proper care.
What is the minimum tank/pond size?
75 gallons, with larger systems strongly recommended.
Is Donkey Dung Cucumber hard to keep?
Donkey Dung Cucumber is rated expert difficulty.
What does Donkey Dung Cucumber eat?
Donkey Dung Cucumber is a detritivore; appropriate diet matches its natural feeding pattern.
Donkey Dung Cucumber taxonomy and care recommendations cross-checked against the following authoritative references and our internal vendor + breeder database.