I have them in all my tanks (β€20 gallons). However, I seal the adjustable hole (at least) with a small dab of superglue as soon as I get them. The opening is too large for most aquariums and can be accidentally opened unnoticed. To avoid overfeeding and the need to clean the aquarium, I just fix it in place. Otherwise the battery works well (lasts over 4 months) and is easy to use.
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