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They keep a steady reliable temp, adjustable thermostat. So I replaced all our heaters with these Stealths. Then when the Stealths had just come out, I tried one and it was a miracle. I had a problem remembering to unplug the heaters when I did water changes on our tanks (9+ tanks) so the heaters would burst, and when I tore down a tank and sterilized everything, I'd sometimes break the heaters accidentally. The one problem I have had repeatedly on almost all the heaters is that the suction cups don't stay stuck to the sides (our tanks are acrylic). I can leave them plugged while doing water changes, don't have to remember to plug them back in afterwards either, if gently banged during cleanings they don't crack or break so I don't have to clean up glass shards. I highly recommend these to everyone always (and now Amazon sells them too).
I bought this heater for an Eclipse System Three (also manufactured by Marineland). This happens seemingly at random and lasts for around a minute or more.In order to avoid it, I had to mount the heater on the left pane of the aquarium, where it is somewhat more conspicuous than in the back, putting some distance between it and the filter motor.Otherwise I am quite satisfied with it, I have the temperature set at 88F for fishless cycling and I haven't noticed it fluctuate more than a degree. When mounted in the area provided for it in the Eclipse, which is directly beside the filter, the aluminum cylinder in the heater sometimes interacts with the filter motor and causes the filter impeller to spin irregularly, which produces a LOUD vibrational noise. Just be aware that if you buy this for an Eclipse System Three, you'll probably end up having to mount it elsewhere than the "natural" spot.
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