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Green Brittle Starfish

Ophiarachna incrassata

How to Care for Green Brittle Starfish

written by Dave Burr

Brittle Starfish are great housekeepers for the reef aquarium and will eat dead organisms, and uneaten food before these items can decay and pollute the aquarium.

Although Brittle Starfish are not a threat to corals or clams, they may catch and eat small passive reef fishes, such as small gobies, at night. Otherwise Brittle Starfish are great reef inhabitants.

Acclimation: Maintaining proper pH, Ca, Alk, & Mg levels is important for starfish. Take the time to do a drip acclimation with any starfish as they do not tolerate rapid changes in water chemistry very well.

Feeding: Provide the Green Brittle Starfish with bits of meaty foods such as mysis shrimp, or chopped shrimp, or silversides. It will also scavenge the aquarium for bits of food missed by the fish.

Care Level: Easy
Reef Compatible: Yes - may become semi-aggressive as they mature
Diet: Carnivore
Range: Indo-Pacific
Family: Ophiodermatidae
Water Conditions: 75-80° F; sg 1.024-1.026 (1.025 is ideal); pH 8.1-8.4 Ca 420-440 ppm, Alk 8-9.5 dKH, Mg 1260-1350, Nitrates <10ppm, Phosphates < .10ppm

Water Chemistry: It is important that proper calcium (420-440 ppm), alkalinity (8-9.5 dkh - run it 7-8 if you are carbon dosing) , and magnesium levels (1260-1350 ppm) are maintained. Raising magnesium levels gradually up to 1400-1600 ppm can help to combat algae outbreaks, just keep CA and Alk in line as you raise the Mg. Nitrates should be below 10 ppm and phosphates should be below .10 ppm. We recommend doing a water change when Nitrate levels rise to 10 ppm. It is important to replace your phosphate media when phosphates rise to .10 ppm. Media Reactors make the most efficient use of your phosphate media by fluidizing it.

Dosing: Vivid Aquariums uses and recommends dosing pumps to automate the dosing of additives and keep your levels more constant. A dosing pump can alleviate the chore of manually dosing your aquarium with Ca, Alk, & Mg 2,3, or 4 times per week and will benefit your aquarium by keeping your levels constant through frequent small additions of Ca, Alk, & Mg. Our tanks all progressed when we switched from 3 manual dosings per week to 70 automatic dosings per week and we got a lot more work done.