I have a 135gallon that is pretty heavily stocked right now, I'm working on thinning it out but right now I have a 10" green terror, 9" Nicaraguan, 2 5" green terrors, 6-7" jaguar, 7 inch geo surinamensis, 4" red hump geo, 2 7" four line pictus, 12 inch synodontis. I am currently running 2 eheim 2217's and an aqueon 75 which is only in there for more surface agitation. I'm going to get rid of the synodontis, Nicaraguan and jaguar, so when they go will two eheim 2217's be enough filtration? I have two layers of mechanical filtration then the rest is filled with ceramic and plastic rings.