bubbles on heater

[mikedel]

I always have bubbles build up on the heater in the back of my aquarium. My cories come along and brush them off for me everynow and then, and other times I will brush them off. No matter what though they always come back. There arent any bubbles on any of the plants just the heater. Should I worry about it?

Thanks
Mike

 

[morleyz]

I wouldn't be concerned, there must be something about the glass of your heater that allows gas bubbles to affix readily.