Well fellas I made my first sump/ refugium. I used some silicone from home depot that was 100% silicone and actually ran out of that stuff so ran to ace hardware just because it is closer. I looked all around for something that was not mildew resistant and came across the silicone 2 GE general household repair and looked all over the tube to and did not say anything about being mildew resistant. But to my knowledge now I find out it is. But I only used this GE 2 silicone on one baffle. my tank was cloudy for about 2 days lost my urchin. So I ran some carbon tank cleared up but I think I lost my starfish today. but my tank looks fine... my 2 fish look okay also my snails, hermit crab and emerald crab look like they are doing good as for my corals they look ehh. My question to you guys is what should I do now? Is my whole tank compromised? It is a 20 gallon high with a 10 gallon as my refuge.