I believe back when I did this in 2009 it was GE “Silicone I” which was like $2-3 a tube locally while aquarium silicone was like $20 a tube. Now I would recommend just using the caulk tube size of the Marineland or Aqueon aquarium sealant. The important thing is to use silicone that does not contains mold/mildew inhibitors and which will kill the inhabitants.
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