Submersible Heater and Condensation?
Hey all you aquarist!
New member here, just wanted to say hello. Besides that, I have a tetra 20 gallon submersible heater that I've had for the past 3 years. I recently set it up after about 2 years with no use. It's been working fine the past couple of days, but now I'm noticing what looks like condensation/maybe water on the inside. I've been researching this and apparently it is a big no-no.
I will include a picture, so please tell me what you guys think.