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With a bubbler and HOB filter, adding CO2 would be a waste since it would leave the water too quickly to be effective. I would turn the bubbler off and see if you get any improvements with the plants. If not, you may also need to consider getting an internal filter or a canister to reduce surface agitation and encourage co2 concentrations.
I would also reduce the light. I am surprised algae is not increasing, but it may soon do so.
Byron Hosking, BMus, MA
Vancouver, BC, Canada
The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]
Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
Originally Posted by Byron View Post