Hydor Heater problem?!

[CorallineAlgae]

Just be careful, with 10wpg of heat you can fry your fish if the thermostat were to fail. It will quickly heat up that 20g (or less) of water in the tank.

That was a concern for my small tank but the catch-22 is small tanks can look pretty cluttered with filter pipes, a drop checker, ph probe, thermometer, in tank heater, co2 reactor, hardscape.. There aren't any really low watt inline heater options. I have my Hydor heater ordered. Just hope, for the little work I'm asking it to do, that it will be a reliable out-of-sight addition (but visual subtraction) to my system. Got an inline co2 reactor coming also. Woohoo!