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yes would be useful, especially as I understand drop checkers give a reading of the Co2 two to three hours late ..?

Yeah understand, was referring to Niru's comment on using bioballs..Your explanation on bigger bubbles bursting up better makes sense and I've have heard this before.. now to test it out. My Co2 pipe is currently placed about 3 inches down so holding thumbs. Presumably if it was slower flow then...

thought this was the case.. yeah, don't want to loose more flow with the bioballs..but take your point

Thanks guys for your input -- yeah the vortex option might well be a good one, thanks foxfish, so you need to come up with a mod Peter :). First step I will try without the ceramic pad and see if this helps. As mentioned I fortunately don't have enough tank cabinet height to lengthen the reactor...

Thanks Dave, will certainly try it..

A bit of a time warp, but here goes with my second attempt with this post, as just when I was getting some good replies, thanks guys, the original post vanished on Black Sunday when the server crashed…:( Specs – Tank 760L, reactor – 360mm length, 60mm diam, plumbed into the Fluval FX5 return...