right now i have 2 bp's in a very secure 20 gal tank. when i am done building their larger 55 gal enclosure i am going to put them in there. i am trying to think of ways to keep something that large of a space secure. the 20 gal. is a perfect system of slide and lock with tabs and slots.. pre made at a factory and only costs 40 $ at the local petco (which i am now boycotting due to their bad handling of animals). anyone have any ideals for the larger tank??