Par meter (check light intensity)
Co2 scrubber (raise PH)
Biopellet reactor (lower nitrate)
Change your rowa phos consistently unlike these idiots that always neglected it (lowers phosphates)
Got the aggressor and victim in the same box, separated by a divider. Will a week like this cure it?
Seems cruel but anyone ever ask about cutting the aggressors fin/tail halfway to slow him down? Disabling a bit, so he no longer is the bully of the tank?