Without any flow all it would do is cloud the water and take up the little space they have. The pacu have started swimming around more every once and a while but it's really off and on. All other fish are doing well including an Oscar and 2 16 inch plecos that are in the same container as the pacus. I have several other tanks and all my other fish are doing well except for a sun/eclipse catfish that has been swimming near the surface a lot and spinning around like he has a swim bladder issue but I think it's from the constant temperature changes and he should be fine, as my redtails and shovelnose catfish are all fineThis is tough sorry man.
Could you out some of the bio from the filters in the tub with them ?