Fire fish acting unusual?

[Cramsey]

I have 6 Firefish in my system and it 3 of them kind of broke away from the pack and started lounging at the top or bottom of the tank. I am wondering if anyone has encountered this? They are fully established, being in my tank for a year. This started about a week ago. Any ideas?

 

[MangoB]

possibly could be low ph had a problem like this with an angel It would swim really erratically in burst for like 30 seconds and then just lay at the bottom. I raised the ph and he chilled out.

 

[Cramsey]

Bump