Is modding the ac filters into a refugium worth it? Does the refugium really work good? Is it too wimpy to work on a 20 gallon nano? Also how can you reduce the flow to the right flow rate?
Yes if you can afford or fit the CPR aquafuge and all refugiums works small or big but yes it would do fine on a 20 and you can adjust flow by moving the intake tube to the left which moves it away from the impeller reducing flow
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