So I'm trying to decide weather to upgrade or just keep my freahwater guys into my 30 gallon and put my SW stuff into the 50 G. I was wondering, would doing a HOB overflow/sump be that bad of an idea? I don't want to cut corners, I been there done that. No thank you! I want to know if I get the HOB overflow I'd be okay, like I wouldn't get flooded or anything. And would I be better off just upgrading. Looking for some deep info. here and I'm doing my own research as well. Thanks in advance for the answers!