Hello guys. Im new to reefing and had a few questions. I have a 75g tank that i just switched from fresh to saltwater about 3 weeks ago. Right now im at the end of my cycle. I currently have 2 damsels and 25lbs of LR and 100lbs of live sand in the tank. I'm trying to figure out what to do about a sump and refugium. The space under my tank is only 20x20 so not much room there. I currently have a 10g tank that im using for a sump. What would your alls thoughts be to have another 10g tank drilled used for a refugium and have it overflow into the 10g sump? Anybody have luck drilling a 10g tank? I've read of success and watched videos but I tried one already with a diamond bit hole saw and it shattered like it was tempered although i dont think they are suppoed to be. Any advice for the refugium or my tank in general would be greatly appriciated.