protozoa

I have a 3g dirted bowl, moderately planted, with a betta and a red cherry shrimp who seems to be cunning enough to escape said betta. The light is fairly high, and i'm adding a bit of DIY CO2, probably too much as the drop checker is on the yellow side. pH = 6.4, KH = 7, NH3/NH4+ = 0.1, NO2 =...