Lily/ Billy does look underweight in comparison with the others. Has he been treated for worms? If the fish have white stringy poop I would use de-wormer medications.
Lily/ Billy does look underweight in comparison with the others. Has he been treated for worms? If the fish have white stringy poop I would use de-wormer medications.
His fins are not spread out. They are held close to his body. Fish with clamped fins are stressed.
This can be an indication of a problem with the water - ammonia, nitrite or high nitrates.