Will an eheim 2229 or 2227 wet/dry filter work well with an external co2 reactor placed on the output side? I have reservations due to the surging water going through the output and wonder if the output hose actually empties inbetween cyclrs. This could cause a build up of undisolved co2 causing minor ph spikes if I am thinking correctly. Maybe a 2126 or a 2128 would be a better idea? Thanks for any input.