Fish Death

How long have you had 2? They usually don't play well with each other.

 

Sorry to hear.. I recently had a perfectly healthy anthias die out of the blue too. Did you move some rocks around/have an avalanch that might have crushed it?

 

Firefish will tend to dwindle down to a single fish unless you have a mated male/female pair. Regardless of when they were added (together or not) and the size of the tank. Ok, in a massive (400+ gallon or something) tank they would probably be ok, but as they mature, they can develop aggression towards their species. People think that they are peaceful since they interact well with other fish in the tank. Not saying you did something that you should have not done. I did the same thing many years ago. I had 2 tanks, and both had 2 firefish that both went down to 1 after a while for no clear reason. That is when I learned about their male/female MATED pair requirement.

Or like you said, it could have been just some natural thing. Just keep an eye on all of your fish for a while to make sure that it isn't a disease or something toxic in the water.

Chin up, and keep moving forward.

 

I have had 4 firefish for going on 5 months now with no problems. They all school up and swim around together. They never try and attack each other or any other fish in the aquarium. I even added them at differnt times. Started with 1 and added 3 more. They seem to be very peaceful fish.