I think a RVT 600 is plenty to drive a mist bar for larger tank applications.

One idea is adding the limewood stone to the canister filter return.
Then using that for the CO2. You'd need a solenoid and a larger tubing section, say a little 1" PVC section and add the stone inside and a CO2 libne hole drilled and glued in place.

I'll think I'll make one here and show folks rather than explain it.



Regards,
Tom Barr