All of the GE tubes I used stated NOT for aquarium use, but I have read repeatedly that it a marketing ploy to prevent a conflict of interest with aquarium manufactures that make aquariums using GE Silicone 1 and is also re-labeled and re-sold under different aquarium safe product names. Only instead of costing $3-$4 a giant tube it re sold for $9-$14 a tube, you know just like the new health care bill.
The only thing you really have to watch for with GE 1 silicone is the expiration date, try and get the most recent batch with the oldest expiration date labeled. The batch I bought at WallSmart on sale for $2.98 a tube had just arrived and had a 2 year expiration date 2012, wonder if that means soothing LOL.