i like to clean hof every 4 weeks, the canister you could ussually go about 2 monthes.
there are factors like how many fish, how much do you feed, the size of the fish.
I feed only what my fish can consune in about 1 minute, to avoid that fallen food that accumulates.
when disturbing the hidden food it is important to vacuum it all up, or you are lickly to get spikes.
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