Just recently I had to take out a dead burrowing crab from my display tank and didn’t think much of it. Now today when I came home I smelled a horrible stench that filled up the entire house, I went to go look at the tank, nothing wrong, (in my refugium I kept 3x Mex tubo snails to get rid of my hair algae problem) but when I went to go look in my refuge it stunk like I don’t know what and noticed that 2 out of my 3 snails were dead so I took them out and tree them away. Now getting to my question, should I or should I not siphon my sand bed because of the stench (if I may note that in my refuge there is little to no flow due to the design of the sump) or is there any way to get rid of it?