Chronic fish death?
My 450GL planted tank is setup for a little over 1 month.
The tank is loading with 110 Tetra and other small fish.
There is an extra large biological filter and I change 20% of water every other day.
The water parameter seemed fine.
However, I continue to lose a fish or 2 every few days.
Some of them seemed to have no external symtons.
They appear to be eating and suddenly died the next morning.
Previously I removed 4 of my fish with Columnaris and 2 were breathing heavily.
They are now doing fine in the hospital tank treated with antibactiria.
My question is, what can be done and should be done?