Dying micro brittle stars

[gotem86]

Today I’ve noticed like 5 dead stars in my little 7 gallon AIO. The tank has an excess amount of these stars, as well as bristle worms. This tank has no fish, only zoanthids, and 2 BTAs. I’ve been feeding the cleanup crew small amounts of Mysis shrimp twice a week, since the CUC has nothing to cleanup. Zoanthids and BTAs are doing fine, no signs of stress. I’m not sure exactly why they are dying, any thoughts?

Nitrates- 5
PH- 8.0
Phos- 0.03
Salinity- 1.026
Temp- 78 (fluctuates a half degree either way)

 

[Webslinger]

feed more = no fish waste to eat

 

[Phycodurus]

The tank has an excess amount of these stars

sounds like your tank has reached its population sustainability for the little guys.