I changed the power filter bags nothing to do with sponges.
I have 2 Bala Sharks, 1 Neon Tetra, 3 Plattys, 4 Tiger Barbs, 1 Angel Fish, 1 Cory Cat, 4 zebra danios
Ph is 7.2-7.3
Nitrite is > 0.05ppm
Nitrate is > 20ppm
Hardness 150ppm Hard
Chlorine 0
Alkalinity 120ppm
Ammonia a little high 1...