what would be sweet is if you can have a small sump filter inbuilt somehow, or maybe sit the gumball machine on a small box which houses the filters/heaters.
plumb it straight up the middle of the machine, silicone the pipe's into the bottom of the aquarium bowl so the whole thing is completely hidden from view
you get heater + improved filtration, and a totally clean look in the tank itself.
it doesnt need to be big, just a little 10L / 2gal tank hidden away in a small stand underneath.
(4ft) 79g / 285L AquaGrande 120 main tank
(4ft) 52g / 192L Fry/brooding tank
(2ft) 19g/ 75L Fry/brooding tank
theyre fully cich'lid, bro!