What I do wuth my hang on back filter is rinse the old filter pad in tank water, cut up the pad, add the cuttings to a new filter pad, put new filter pad into filter, refill filer with dirty water that was used to rinse pad. All the BB stays in the filter this way.
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a 29 gallon high tech planted Chasing Red
, a 20 long low tech, and a 75 gallon salty adventure