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Riccia on a branch a stone etc. If it's got bubbles at least 1/2 the lighted
day then there's enough CO2. Heavy breathing fish, too much.
Rather than messing with that or a indicator kit etc, do the right thing.
Get a pH monitor like a pinpoint and see what you CO2 is really doing. It's
continuos accurate and the best way to see what your CO2 is doing. Cost more
but it's plain worth it. KH doesn't vary that much in most cases so all
that's left is pH. At a glance you'll know what's happening.