I need help. I have a 55 gallon tank and I 12 fish in tank. I had did water change 2weeks ago and in the last 4 days I have lost 4 and water test have been perfect. No change in water temperatures.
I have clownloach, 2 fancy mollies, 3 beta's, tetra, 2 algae eaters, 3 dwarf grummies, I have...