Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
A 10 is much lighter even when filled with water, so the silicone is much less stressed. Ought to hold up a long time.
I have tanks that are about that old, 10-20 gallons, and they are fine.
The ones I am having problems with are a few I acquired from someone who kept them outside, subject to the hot and cold of being in a barn, dry. I have been able to reseal only one of them (the shallowest), I think I have to totally rebuild the other 2. The seams have popped open more than once, when all I did was reseal.