I noticed this morning that the heater in my betta tank is making a quiet buzzing noise. It is one someone gave me so I dont know how old it is I have taken it out do you think it is dangerous?
A buzzing heater is not a good sign. I have yet to have one of mine do that, and would be worried if it did. Heaters are pretty cheap, mixing water with electricity could be dangerous.
Heaters are the usual suspect when people get zapped from a tank, a gfi outlet or powerstrip should be used with any aquatics related equipment.