Ok so my 38 Gallon planted tank has readings of 0 0 10 right now. I am starting to do research on what fish to add next. currently I have two gold gouramis (zero aggression between the male and female) and 4 albino corys. I know I should probably get the corys up to the number 6. -Do I have to add albinos or can I add a different kind? Besides the Corys what should I add? I was thinking Angelfish maybe. Oh yeah no neon tetras. Had such a pain in the time getting them to acclimate to my 10 gallon I never want to buy neon tetras ever ever ever again.