If you were to depend on a filter and connect chiller and reactor, i guess you'll need at least a 2026 or 2217 to get enough flow.
What i would recommend is a seperate pump for the chiller and reactor like the eheim compact but no doubt it'll take up space in your tank.
Would suggest dennerle cyclo as reactor as its the most efficient co2 mixer in my opinion. Comes at a premium though.
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