Brittle stars

[mbgrubb15]

Been posting a lot lately.

The past couple days all my small (2in) brittle stars have been coming out of the rocks. Had them for probably 6 months and usually only seen their arms coming out for food.

Now they are all on the glass and seem to be dying. Most are losing legs and some have a hole right through the middle like a donut.

My water params are fine. And made sure ammonia is zero.

Does anyone have any ideas on what's going on?

Thanks!!!!

 

[KathyC]

Are you dosing anything at all into the tank, or have recently treated the tank with a chemical?
How often are you doing water changes?

Wha are ALL of the tank water parameters including ca- alk - mg, temp, pH. Something is wrong with the water if they have holes through their center discs

 

[mbgrubb15]

Cal - 450
Ammonia - 0
Nitrates - 10
Ph - 8
Temp 79

Don't have a tester for alk and mg but I have had the tank up for about a year. I added a mangrove but that was doing well in a friends tank

 

[nyguardian21]

Can you post a pic of the stars with holes in them?