What do you feed your rays? How big is the tank and how big are the rays?I also have my ray tank on a drip and have never smelled it either. My tank is bare bottom with good flow so most the crap ends up going over the overflow to the sump but my sump is open without a cover, I do change filter socks every couple days but it really doesn’t smell. I couldn’t imagine ray keeping without a drip don’t know if it helps with the smell but it does with everything else