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  1. Adding new filter intake/outtake, leave old lines till the new colonize?

    Beginner Freshwater Aquarium
    I have a 45g tank with about 14 fish. It's a relatively new tank, and about 4 weeks in. I haven't seen any spikes but keep it safe by checking my water every other day. Currently I have a penn-plax 1000 canister filter. I didn't want to spend a lot of money on a premade intake /...
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