Harlequin Shrimp Care and Starfish Diet: Husbandry Guide
Hymenocera picta is one of the most visually striking invertebrates in the marine hobby — and one of the most ethically complicated, because it eats nothing but live starfish. This harlequin shrimp care starfish diet guide from Gensou Aquascaping at 5 Everton Park is an honest look at what keeping them actually costs, how to source Linckia and Fromia sustainably in Singapore, and why we recommend most hobbyists admire them in other people’s tanks rather than buy their own.
Quick Facts
- Adult size: 5 cm, sold as bonded pair
- Minimum tank: 60 litres for a pair, dedicated species tank preferred
- Parameters: 25-26 °C, salinity 1.025, pH 8.2
- Diet: live starfish exclusively — Linckia, Fromia, Asterina, chocolate chip
- Feeding rate: one small Asterina per shrimp every 5-7 days, or one leg of Linckia per 2 weeks
- Lifespan: 2-5 years
- SG price: $40-80 per individual, $80-150 bonded pair
Why the Diet Matters
Harlequin shrimp are obligate asteroid predators. They do not eat mysis, pellet, or any prepared food — hobbyists who claim otherwise are misreading a shrimp that scavenged once and starved shortly after. Before you buy a pair, you must have a reliable supply of live starfish for the full expected lifespan. That is two to five years of sourcing, ethical questions, and recurring cost that can exceed $50 per month at peak feeding.
Sourcing Starfish in Singapore
Three practical options exist. The first is farming Asterina — small pest starfish that plague many established reef tanks. If you have friends with mature systems, you can harvest their Asterina for free, and a single healthy reef tank produces several dozen per month. This is by far the most sustainable route.
The second is ordering chocolate chip starfish (Protoreaster) at $8-15 each from local marine shops — cheap, hardy, large enough that one leg feeds a pair for a week. Shrimp amputate a single arm at a time, and the starfish can be kept alive in a holding tank to regrow limbs over months. This approach sits in a grey ethical zone that hobbyists must make peace with.
The third is buying Linckia or Fromia from the ornamental trade at $30-60 each. Both species are difficult to keep alive even without predation, and using them as feed is difficult to defend. We do not recommend this route.
Tank Setup
A dedicated species tank of 40-60 litres is ideal. Keep the harlequins separate from any display where you value your cleanup crew, because they will take every Asterina first and then move to any vulnerable starfish in the system. Mature live rock, sand bottom, moderate flow, a small skimmer or refugium. No strong current — they are not athletic swimmers.
Tankmates are not strictly necessary. If you want some, small shy fish like gobies work. Avoid wrasses that might bully the shrimp, and anything large enough to take a moulted shrimp during the vulnerable period.
Pair Behaviour and Bonding
Harlequins form lifelong pairs and work cooperatively to flip and subdue starfish. Buying a bonded pair is worth the premium — two random individuals introduced together may fight for weeks. The pair shares each meal, flipping the starfish upside down and feeding on the tube feet and stomach area while the prey is still alive. This is not squeamish-friendly. Consider this before purchase.
Feeding Strategy
A pair consumes roughly one chocolate chip leg every 10-14 days, or three to five Asterina over the same period. Rotate live starfish in and out of a holding tank that provides good water quality and feeding for regeneration. Never introduce a starfish that has been in a tank with copper or formalin; trace residues carry over. Moulting harlequins need two to three extra days between feeds.
Moulting and Water Quality
Like all crustaceans, harlequins moult as they grow. Iodine supplementation at reef-safe doses (we use Red Sea Reef Iodine 1 ml per 100 litres weekly) supports successful moults. Specific gravity must be stable — a drop from 1.025 to 1.022 will kill a mid-moult shrimp. Leave the old exoskeleton in the tank for 24-48 hours; the shrimp eats it to recycle calcium.
Ethical Honesty
We are clear with buyers: keeping harlequins requires live prey, and no trick makes that go away. If you are not comfortable with the husbandry, do not buy the shrimp. If you are, the species-only tank with farmed Asterina is the least ethically fraught approach and produces a stable, long-term pair display.
Related Reading
emilynakatani
Still Have Questions About Your Tank?
Drop by Gensou Aquascaping — most walk-in questions get answered in under 10 minutes by someone who has set up hundreds of tanks.
5 Everton Park #01-34B, Singapore 080005 · Open daily 11am – 8pm
