I'm planning on building a sump for my 50 gal and I was just wondering what pump I should get and what gph i need. I've heard alot of good stuff about the rio 2100 and its not super expensive. Whats the difference between these and getting a regular sump pump at home depot besides that the sump pumps are like 1100 - 2200 gph and the rio is 800gph. Are the rio's and other powerheads alot quieter?? Sorry don't know much. Any advice would be great or if you could point me to past articles, I can't find any so far. Thanks.