I recently set up an old 10g tank for a couple of elderly corys but needed a new heater so I bought a Tetra and everything has been fine for the two weeks or so it's been set up - until last night. The thermostat stuck and I woke up to find the temp over 90 and two very dead fish. I threw the piece of #!%& in the gargbage where it belongs!
DON'T BUY CRAPPY TETRA HEATERS - THEY'LL KILL YOUR FISH!!!!
DON'T BUY CRAPPY TETRA HEATERS - THEY'LL KILL YOUR FISH!!!!