What is a safe sealant to use

I have some decorations I would like to make for my aquarium but since it has been twenty plus years since I have had one, I would like to know what type of sealant is safe for use in my freshwater aquariums. Please advise.

Thanks,
Dan

Just use aquarium sealant. If you are not doing a lot of gluing, it would be cheaper to buy a small tube at any fish store. Just let sit and dry for 48 hours or more before putting into the aquarium.

And the drying time is very important

GEI silicone is also aquarium safe. make sure its GEI not GEII

if it says 100% silicone ...than you can use it.

just be sure its 100%

when i re sealed a tank last summer i got tubes of it from walmart for 3$..big tubes..let dry for like 4 days and filled up..did a test run with some guppies all was fine.

Excellent, thanks for the advice. Looks like I'm going to have a busy weekend.

Dan