its probly not going to be enough... ITS THE SAME PRODUCT, so it doesnt matter..., you have enough to do the whole tanks with 5 tubes..., first you run a bead on the paynes assemble, and once its put together. you need to apply more silicone to the inside and smoth it out.pressing the silicone into the joint where the two pieces meet... and its at this voint that goes along the inside of the tank that i recomend taping off 1/4" on each side...