I got 5 acaricthys heckelii a month ago and have lost 2 since. Both have developed the same symptoms, heavy breathing then gasping, loss of appetite, slight colour loss but slightly redder around around the head, then die a few days later.
Water quality is fine, no ammonia, no nitrite, low nitrate. I water change weekly and have increased this in the last few weeks. Tank is 300L with cf1200 and fluval 405 filtration. I tried adding Epsom salt thinking it was a kind of bloat. The sick fish don't appear to bloat but a slight bit of swelling near the vent.
I want to make sure I don't loose any more or any other fish.
Does it sound like a bacterial issue or parasite?
I want to treat the whole aquarium rather than separating them to ensure I get rid of the cause.
Any suggestions would be greatly appreciated.