I know I want a good fuge for both nitrate export and zooplankton/microfauna production. I have a 50 gal that I could probably fit a 10 gal tank under for a sump fuge but Ive never tried a sump setup before and I cant drill the already-filled tank. Im worried with my inexperience that trying a sump without drilling might end up with a potential for flooding. Anybody running a sump without drilling the tank (using an overflow)? Is there any foolproof setup to prevent flooding? Is it all worth it or should I just save my money and by a hob aquafuge? I know I would appreciate the extra space a sump would provide but I want to stay safe and simple. Thanks for the input!