i've been planing a 180 gallon aquarium for a few weeks now. Built my stand out of 2x4"s and 2x8"s. I have someone that will order my tank for me (Perfecto rr 180) for about $930. I seen a website that has a sale on a Perfecto 220 gallon for real cheap $700. I want to know is there a big difference between the 180 and 220 or can i basicly run the 220 same as i was going to run the 180. 220 is just 6" higher.