my ph is really low like 5.0-6.0 but all my fishes are doing fine. i have a 55 gallon with 1 gold severum 1 geo jurupari 2 blood parrots. before i had a silver arowana that only ate feeders and attacked all the fish he wouldnt even eat krill. then i traded my friend and in his tank ph of 7.0-7.5 the silver arowana is nice and eats krill and doesnt even touch the feeders. in my current 55 the gold severum is chasing all the fish and biting them. so my question is ----- DOES LOWER PH CAUSE AGGRESSION? IF NOT THEN WHY ARE MY FISH SO AGGRESSIVE??