I would call Tremco and call them to find out about its use and see if it contains anti-mildew.
from what I understand, most tubes of silicone contain anti-mildew addtives.
general rule of thumb for silicone, don't use it unless it says safe for aquarium use.
it is just not worth the possible problems to save a few bucks.
also, I don't know how long you let it cure..that could be problematic as well.
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Way too much time and money has gone into this hobby....and yet, I CAN'T STOP
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