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When cycling with fish you need to make the needed water changes for the safety/health of the fish, vacuum at least one time a week and scrub the front and side walls as needed, true that the nitrifying bacteria are sticky and adhere to everything in the tank and in the top layer of substrate, however, most of the bacteria are in the filter media, you want the filter media to look dirty with a good water flow so only give the filter media a good swish/rinse in old tank water with a water change 1-2 times a month or if the water flow slows.
How long have you been cycling and what are your water pram numbers for ammonia, nitrite, nitrate, pH
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