Silicon

Hi @bluefronted Clear Bostik Marine Silicone or Black Den Brave Aqua-Silicone you also get a neat silicone applicator with different angles on it really makes your life easier ;).
 
For tank builds I use bostik marine clear, it's a good old faithful, but for black tank builds I go den braven black!

A bit more pricey abut way better to be safe than sorry
 
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