The only other stimulation I can think of besides the ones others have mentioned would be rearanging their tank. One of my bp is in a tank and every couple of months I'll switch out different hides or just switch the hides sides. Also i have some fake plants in there that suction cup to the side of the tank which she usually feels the need to knock down lol. Other than that no not really any stimulation like mazes or anything lol.