I have a standard 55 Gallon rectangular tank that has been running for about 6 months, so far i have one red turquouise discus, one synodontis angelicus, 8 tetras of some kind or another, 2 kulli loaches, and a royal golden pleco. eventually when i put everything in i want, i will have 4 discus, 1 royal golden pleco, 1 synodontis angelicus catfish, 1 black ghost knife fish, 2 kulli loaches and 8 tetras (i think black phantom, it seems to ring a bell). Ive heard that the pleco should be in a larger aquarium, but the guy i get my fish from says it is fine (hes reliable hes helped me set the thing up from the begining and has been a small pet shop owner for atleast 20 years). I dont anticipate any aggresion problems between these spieces. I have an ro filter and i can pretty much specify the water any way i want to find a nice average to suit all fish. I have 2 penguin 280 filters on it with 2 standard carbon filter pads each which get left in for 2 months but get rotated around so only one is replaced every 2 weeks. I do a ten gallon water change every weekend. I have a small pump in the aquarium to to help circulate the water. There are no real plants just fake decorations and plants, but plenty of places to hide. the substrate is half gravel half sand. My question is this, is my final fish list overstocking? and if i am can i cheat it by doing larger or more frequent water changes? ive done the math and its close. I want the fish to be healthy and grow a certain amount. If there is anyone who has any advice based on real life observations i would love to hear their imput thankyou.