I put my heaters horizontal on the bottom of my 55G tank, this way it's never uncovered. If the heater is uncovered I will have bigger problems and dead fish.
With that said I have a 29 Gallon Bio cube that has a heater vertical, and I almost did the same thing today when I did a big water change.
With that said I have a 29 Gallon Bio cube that has a heater vertical, and I almost did the same thing today when I did a big water change.
