I have a tank containing only Bristlenoses, these are behaving in a peculiar manner ; hanging on the glass and shimmying their bodies, racing to the surface and gulping air. Some have a red appearance around their mouths.
We have checked the PH. OK.
Nitrites, up very slightly.
Ammonia, OK.
Furniture in tank, Heater (23deg) 1 piece of wood, 2 pieces of schist rock sitting on a couple of smaller stones, 2 sponge filters.
The aireating of the tank seems to be adequate.
If anyone has any ideas about the problem, I'd be happy to hear from you.