Not something you would want to deliberately set out to do, but I have to ask: what happens when you put in too much CO2? For the last 2 days since the water change I have possibly over shoot my CO2 to get to a level where my drop checker is verging on yellow, not quite there, but almost there if you know what I mean. It wasn't uncomfortably enough for the fish to start acting stressed but I noted that pearling basically stopped. And this at high CO2! What I need to know is if this true, does having higher CO2 stop pearling somewhat? Either my drop checker is wrong or my dosing of the ferts is not enough. I ask because I saw what was happening today and turned the CO2 off for the level to recover and the plants started to slightly pearl again. I deduce it can't be lack of ferts since this has been constant all this time.