I have a 40 gallon tank running 1 watt per gallon and some low light
plants. i'd like to see more growth with my anubias nana's & barteri's
and java ferns. i'm thinking of doing a DIY 1 liter bottle to add a
little CO2, and connecting it to the air inlet on my powerhead.

anyone do this or have links/suggestions of a similar setup? should i
worry about it affecting the harder water conditions? thanks!

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