1 gal, 10 gal, 29 gal, 55 gal. I only have a 1 gal and 10 gal set up at the time, still settling in to the house a bit... :D Over-crowded tank: (10gal) 3 cherry barbs, 4 Guppies, Angelicus Loach, Dwarf Puffer, 2 Red Wag Platies, White mickey mouse platy. (1gal) Eng. Lace Fancy Guppy, and a Chinese Algae Eater...