I've had this product for a while and it does the job. It keeps the water warm and does not harm the aquarium. π I don't think it will fit 20 gallons due to its length. π If you don't clean the top, marks will remain on it after a while. But a simple scrub will get rid of it. π§Ό The suction power is excellent and it has never come loose from the back of the tank since we put it on.
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