Need to know the best adhesive for holding air stones to the bottom of plastic Res.

I've used water proof silicone caulking, it floated to the top, I've used PVC cement, it floated to the top and melted some of the plastic on the air stone too. I'm trying to make my first DWC out of a 10 gallon Sterilite tote. Whats the best stuff for holding an air stone down, my air stones look just like this>

http://www.walmart.com/ip/Aqua-Culture-Bubble-Aquarium-Stone-1-ct/10532630

:roll:

http://www.loctiteproducts.com/p/cntct_putty/overview/Loctite-Fun-Tak-Mounting-Putty.htm (can be found at walmart)
this is what I use its water proof and does not effect the plants but the air stones through a T shaped pvp bracket (40 cents) then tak it to the bottom
 
Back
Top