Why did my fish die?

[arking_mark]

I feel the BTAs and Urchins would be hit first. Even fairly injured clowns are quite hardy to params when compared to those two

Good observation. If the Urchins, snails, hermit crabs, and RBTAs seem unaffected. What does that rule out?

 

[SlugSnorter]

Good observation. If the Urchins, snails, hermit crabs, and RBTAs seem unaffected. What does that rule out?

Params or meds

 

[arking_mark]

a weakened clown can still be killed by an RBTA.

This seems plausible. So the clown tried to interact with the anemone and was stung to death...

 

[arking_mark]

Params or meds

What about low oxygen?

 

[SlugSnorter]

What about low oxygen?

Possible? unlikely without bacterial bloom and/or poor surface agitation.

 

[arking_mark]

Possible? unlikely without bacterial bloom and/or poor surface agitation.

None of that. Overpowered powerhead in the tank...

 

[SlugSnorter]

None of that. Overpowered powerhead in the tank...

that doesn't guarantee proper surface agitation. Could the clown have gotten sucked into powerhead? or otherwise battered by strong current?

 

[SlugSnorter]

None of that. Overpowered powerhead in the tank...

do you have any filtration chemicals in the tank? even counting something like GAC.

Any other toxic animals present?

dealing with any pest algae or flatworms that could have toxins?

 

[arking_mark]

that doesn't guarantee proper surface agitation. Could the clown have gotten sucked into powerhead? or otherwise battered by strong current?

I'd say no to both.

 

[arking_mark]

do you have any filtration chemicals in the tank? even counting something like GAC.

Any other toxic animals present?

dealing with any pest algae or flatworms that could have toxins?

Nothing. Just using live rock for filtration and some Chemipure Blue.

 

[arking_mark]

Ok. An additional observation...my GSP rock is not fully opening. It was open all day, now they are half extended. I'm guessing something chemical is going on.

Another piece of info I did not mention is the RBTAs were in need of rehab....they have little color and little to no tentacles. I got them from a tank they were failing to thrive in...other BTAs there were fine.