10 gal tank, with 3 lemon tetra, 1 african dwarf frog, 1 guppy, and my sick graumi. The tank has a bio filtration system and a water blower. I checked my levels this moarning and nitrate was near 0, nitrite was near 0, hardness was soft 75, Alkalinity was moderate 80, pH was neutral 7.2 and...