Don't put any filter media in the canister filter long term. You could use it to polish the water and then remove or rinse out the media frequently. Leaving it in there will create a nitrate factory which corals do NOT appreciate.
Live rock rubble inside the filter is usually what people who do add a canister do, but most do not bother with a canister filter at all. Want more flow, add another HK.
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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