I have a 518 gallon tank that will be tested to see if it holds water after my re-seal this weekend, it's 7 feet long 3 foot 4 wide and 3 feet tall.
A 55 gallon with some BP's, a convict, rosy barbs, dwarf gourami's, and a few clown loaches growing out for the 518.
A 20 gallon breeder with a pair of cons and some fry.
A standard 20 with a few corys, and a weather loach