When I tried this product, my fish became stressed and the temperature fluctuated constantly. The display was difficult to read and the instructions were unclear. The only positive is that it is affordable, but at the risk of harming your fish. Don't waste your money on this heater, invest in a better quality product from a trusted brand. This heater is a disappointment and a hazard to your fish. I should have looked for other Pet Supplies to trust with my fish.
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