I have been planning on adding a new setup in my house and can not decide what to do. I started planning to do a double stand with 2 - 48 x 18 x 20 ( 75 gallon ) tanks. I am now second guessing maybe doing 4 - 36 x 18 x 16 ( 40 gallon) or a single 72 x 24 x 24 ( 180 gallon) tank. I have the space to do any of the three but it will be my last upgrade untill I kick my kids out and build a fish room (at least 5 years). I realy would like a bigger tank but I like the idea of different tanks for greater diversity sounds good to. I know that no one can decide for me but any thoughts or experiences would be apreciated. Thanks in advance for your input