Thanks for the replies Tom.
I have been increasing the CO2 but think my diffuser isn't efficient enough so I have ordered a better one. The response of the Cabomba is surprising as I would have though it would have preferred the low pH (and thus higher CO2:HCO3- ratio) but it didn't. But I have changed many things at once so it may be the switch from mostly Aquastar to mostly Cool white which is the problem. I'm not back to 1 Grolux: 1 Cool White: 1 Aquastar and will see how that goes.
I have 172.4 W/m2 (or about 850 micromol photons/m2 based on the wavelength of yellow light). Guess I need to tone this down or increase the CO2... My Riccia, at a depth of about 40 cm, pearls while other plants don't. In the past I used to run 153 W/m2 over this tank without any algae and luxuriant plant growth---of course back then the tank was very overstocked so plant nutrients would have been in excess.
To increase the day-time CO2 I would turn off the filter during the day. The fish would be hanging about near the surface of the tank by midday so the CO2 was very high of course, K, Ca and Mg was lacking... Maybe that will change not that they are added.
Thanks again for the information and articles.
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