Today I finally got the 20 gallon filter for my gourami's 10 gallon tank. The tank currently has 30 gallons of filtration and in a few weeks when the BB takes hold in the new 20 gallon filter the 10 gallon filter in the gourami tank will be moved to my 10 gallon platy tank so both tanks will have 20 gallons worth of filtration. Hopefully this will improve my water quality and help my fish out. Also bought some internal parasite treatment, and I'll be treating all my fish in the next few days. After that I'll be buying fish vitamins to treat for vitamin deficiencies as that might also be a cause for the symptoms my platys are showing.