Aquarium Safe Sealant Tube?

Hey guys. I am building a sump and I don't think I have of aquarium safe silicone (DAP) from Home Depot. I was going to get a large tube I can use with a caulk gun, but I am not sure what to get. The small tube I got at Home Depot said it was safe for aquariums, but I didnt see a large tube of the same product there.



Does anyone know of something I can get from Lowe's/Home Depot that is safe for aquariums and comes in a tube for a caulk gun?