Tom:
Thanks! That makes sense, especially since I've had quite a bit of growth in the last few weeks, as well as adding new plants.
I have a 90 gal. tank; 4 T-5's (right on top) and pH-controlled CO2 supplementation, using a Cerges reactor downstream of the return pump from a covered wet-dry. KH is about 3 -4. Prior to adjusting anything, I checked the pH meter calibration, and it was off by 0.3 - 0.4 (it was reading artificially low). Setpoint is/was 6.2. The drop checker (two bulb with a 4 KH standard) read a tad yellowish. Right now for the short term I'm going to let things go with a re-calibrated pH controller and see if the BBA growth stops, or do you feel otherwis
From what I've read on your site, I realize you're not a big fan of either drop checkers or pH-controllers, but there are many of us who don't have the keen eye for plant conditions that someone with your experience and knowledge has. Now I know to check CO2 if I see a wisp of BBA appearing.
But if you didn't have the experience you have, how would you proceed in adding a bit more CO2 to the tank?
Thanks for the help!
Tanksalot