Youd be better off using some sort of aquariumsafe silicone- you can find it at most pet stores - or you can use the aquarium safe "glue sticks". We just started carrying them where I work in the tiny saltwater section.
Fish deserve time, effort and lots of care!!! Please don't impulse buy!
55 gallon, 46 gallon, 10 gallon, 5 gallon, 2.5 gallon