ay jj, its normal for reds as juvenilles to nip each other, and sometimes even cannablize the smallest P in the group. you know how i have like 50 babies still, i lost like 4 or 5 because they were the runts in the shoal, and got picked off.
get the pH as close to 6,
water temp to 78-80
get ammonia, nitrates, nitrites down to 0
and i say you should get a powerhead , but not too strong of one.
get some blackwater extract if you want.
and how are your reds doing?
wat are you feeding them now?
mine are pretty crazy, im hand feeding them and their getting close to 2''.