Had a quick question for planted tank folks. My plants have been kick butt for about 2 months now and then all of a sudden my crypts took a turn and got a bunch of brown leaves that developed holes and it looked like they just decide to commit suicide. In addition to this, I started seeing some very trace amounts of BBA (I am talking about miniscule amounts) and some weird green algae that almost looked like java moss on the roots of my frogbit. Looking at the diagnostic charts, this seems to indicate a CO2 deficiency or maybe even circulation issues in the tank. Is this the correct read or do I have some other nutrient issue. Substrate is sorta like the stuff listed on the forums here except the calcined clay is replaced with safe-t-sorb and my cap is red flint gravel and safe-t-sorb mixed. I dose flourish excel for CO2 right now. I had not been dosing flourish really that much at all because the substrate is relatively new and should have a lot of nutrients in there. When stuff started going bad, I dosed some flourish just in case. My thoughts were - maybe my tank is planted heavily enough that I need to up my excel dosage? Maybe my frogbit is out control and absorbing most the CO2 and blocking too much light? Thoughts? I cut the bad growth off this morning but there are still some browning leaves. I can take pics if that helps. most the crypts are wendtii green variety.