Instruct: Classify the given Amazon review as either positive or negative.
Query: Does not work

I think I got a bad heater, compare to the reviews on here mine doesn't work at all. The temp inside my tank was 75 degrees; I put the heater in and set it to 79 degrees. 3 hours later I come back to check on it and the temp inside the tank was STILL at 75 degree. I see the little red light turning on the heater & I touch the heater inside the tank it was some what warm so I thought it needed more time. Over night it even went down to 74.6 degrees inside my tank with the heater on. I even turn the heater up to 80 degrees still my little 3 gallon tank temp is at 75. I would send the heater back but it's not worth the shipping to send it back. I bought a marine land heater & it's doing a great job.