I have used it but here is what they actually say .
There was a thread going around the other day
If you wish to read it you can find it at
http://www.reefcentral.com/forums/showthread.php?s=&threadid=751264
Here is GE info
GE Silicones does not manufacture silicone sealants
for use in underwater
applications. Examples of underwater applications
are: swimming pools, saunas, hot tubs, spas, Jacuzzis, boats or any other marine vehicles. The only exceptions are the following sealants, which may be used for sealing small
(i.e., 5 gallons or less) aquariums:
GE012 -- 10.3 fl. oz. cartridge -- Clear
Silicone Rubber Sealant.ââ"šÂ¬Ã‹Å“
GE361 -- 2.8 fl. oz. squeeze tube -- Clear
Household Glue & Seal
Application must be as follows:
Glass to glass use only
Sealant must cure for a minimum of five days
before exposure to water
The products listed above should be used as
sealants only, not as structural adhesives.
NOTE: Use of other grades of silicone in an aquarium
or failure to let the sealant cure for the proper amount of time could
cause harm to fish or other life forms in the aquarium.
Hope it helps