The Puffer Forum

Hi, I have a brown algae/diatom issue that I cant seem to get under control. I have a 20 gallon, fully cycled(5months) puffer only tank(3 Amazons, 2 Dwarfs). It’s a planted tank with sand substrate. I have a hang on back filter with charcoal sponge, seachem purifgen and phosguard as chemical filtrat...