To my knowledge it is a Rainbow issue only. If you read my original post you will note that I indicated that there is a way to negate the effect of the CO2 on the Rainbow's. I don't exactly recall the method but I have an inkling that is was Flourish dosing. You would be well advised to ask your LFS what they are doing!Is this an Australian Rainbow specific issue? My local LFS has a community planted display tank with Rainbows and 30ppm CO2.
Vic