
I have returned two Eheim heaters. They stayed at 78 out of the box but they were very difficult to tune and I honestly could get them to tune even lower and then everything seemed to go out of calibration. I've ventured a pair of these Nicrews, the 100w for the 20g and the 200w for the 29g. I've only had them for a month and am very happy with them. I have several Nicrew flashlights and they have been great too.

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