Condensation jager Eheim heater

[reefgirl189]

Had this happen to me as well, when I had a FW tank. The heater exploded one day with a dramatic puff of black smoke. No fish losses but it was a PITA to fish out the glass shards from a tank with a jumpy 20" silver arowana.

I'd throw it out or use it in your salt mixing tub instead.