So long as it doesn't make any claims to being "mildew resistant" or claim to repel any other kinds of fungus it should be fine. Anything with a fungal repelent is baaaaddd news. If your still not sure you can get perfecto brand silicone at just about any
LFS. I know that petsmart sells it as well. I have built about 6 sumps with the perfecto brand and it holds really well.
Have you worked with silicone before?
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Here's to swimmin with bowlegged women.
-105G
SPS Reef with 30G Sump/Fuge Combo
-30G LTAnemonarium with mated porcelain crabs, 10 sexy shrimp, and 2 pink skunks all tied into the other 135G in my system.