I dont think anyone can give you a specific answer exactly how long they last. You'll get opinions based on personal experience, anywhere from 2-3 months to 6 months plus. The type of substrate probably plays a role too, high cec vs low, etc
Ive used them a lot in several different tanks, all with inert sand substrate. My personal opinion is they're good for at least 6 months. ymmv
Do the plants still look good, growing well? If yes then dont worry about it. If not then it may be time
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