I have a 55 gal.
Would it be OK to use one of those "hang on" type.....or are they to small?
My stand doesn't have too much room in the bottom, so I'm considering one if they can serve it's function.
Any help is good help. You can get a big one and it will do a bunch of good (depending what you put in it.)
I built one for my 7 gal bow. It ran about $20 for everything.
Well, CPR makes a 36" Aquafuge which would hang nicely on the back of your 48" tank. If you can't buy one locally or get it made, eBay has actual CPRs as well as knockoffs for less than $100.00.