What brand name or type of sealant should I use to glue decorations together? I've seen several clear types but I don't wanna risk it till I hear from you guys.

I always use 100% silicone, from the hardware store. I have resealed tanks with it and it is safe.

Thanks, I'll pick some up tomorrow.

Just make sure it says 100% silicone on it. If you need pics I can post one!!

most silicon base are safe including the one used in
hot glue gun.

I almost got some of that then figured it was toxic. Now I can get busy building I'm off to bed, ya'll have fun!

just make sure they are all properly cured before
putting inside the tank. better drowse or soak them
with water before rearranging.

i only use 100% silicone........and NOTHING else

I just need something to anchor rocks together so there's no chance of one falling over and hurting anybody.