I have a 55g long with a standard aga stand. I have decided that i want to build a sump, is a 20g long a good choice? also will it fit in the stand without any modifications since I would prefer not to have to take down my tank to set up the sump. Also does anyone possibly have any blueprints or some good info on how to set up a diy sump. I am on a budget and the acrilic sumps taht are prebuilt are out of the question as they seem to be very expensive. I am new to all this so any information about sumps is greatly appreciated.Also my tank is not drillled so I will have to get an overflow box, I have found some good prices for these just not sure what size I might need Thanks in advance