How do i control them? I read lettuce during lights off? Dont have bottom feeders. I just have ghost shrimps. Its a 25 gal
planted. I got 8 harlequins, 6 black neons, 1 male & 1 female betta, 2 otos, 4 ghost shrimps and 2 mystery snails. Got 2 filters running. 1 moving bed with k1 media and 1 hob
with bio ceramic and sponge. I know corys have to be in a shoal of at least 4.