Hydor 7.5w Slim Heater for Mini-Aquariums and Bowls up to 5 gal

I have had no problems so farthe temp seems pretty steady. Came with a little clip for the cord; it stays under the gravel and hasn't cooked anyone/anything yet!

I am happy with this so far. I used for a 2.5 gal betta long lank with 2 bettas in it. It kept them warm and hope to use again when cold months come again.

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I bought this because the 15 watt version heated my 6.5 gallon tank an average of 12 degrees warmer, rather than the "5 to 10 degrees" promised if you have a tank that's the recommended 5 to 10 gallons for that size. However, the 7.5 watt version makes barely any discernible difference in temperature 1 to 2 degrees at most! I really don't see how there's this much difference between the two, but clearly, their recommendations are off for both of these. I'd use the 15 watt one for no less than 7 or 8 gallons, and the 7.5 for no more than 3 or 4 (I tested this 7.5 watt one in a 4 gallon bucket and it raised the temp by about 5 degrees there.) Overall, a good product, with really exaggerated size ranges.

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