All the fish were doing fine up until 3 weeks ago when my tiger barbs started dying.
, and Nitrite
levels are all 0.
Ph and water temperature are fine.
I have tried a broad spectrum medicine, parasite tablets, and bacteria medication.
Every week I do a 10-15% water change and every 5 weeks I do a 20% water change and vacuum the gravel.
So far I have lost 7 tiger barbs and 1 algae eater. Currently in the tank I have 3 mollies and an algae eater.