Well when the fish room originally started I had all 10-20 gallons and some other bigger tanks. From there I went to all big tanks 7 being over 100 gallons and now I'm having problems with filtration and have been loosing a lot of fish so now I am going to build a system out of 20 gallon tanks.any tips on building one in gonna have then pump pump the water to the top row and then flow the the row under it. The dump will be on the bottom right of the picture under the 220 gallon tank and the wall straight ahead will be turned into the system. The sump will be a 75 gallon tank packed with lava rock. I think it should be plenty a buddy of mine had 31 tanks 10-29 gallons hooked to a 55 gallon sump and is doing just fine 
