So I used to have DIY CO2 using a bell as the method of diffusion in a 5g with about 4wpg. The plants did absolutely fabulously - I had some dwarf hygro, a lobelia cardinalis, some unnamed plant, and some rotala indica. They all grew huge under the influence of the CO2 (and no other fertilization) and there was almost no algae - some hair algae, initially, but I pulled it off and it never grew back.
Then I decided that the bell was taking up waaay too much room in the that little tiny tank and tried using Flourish Excel. Well, dontcha know, the algae came back with a vengeance! I've got some brown algae, a ton of hair algae, and something that is attacking the edges of the leaves and eventually covers the entire leaf, and it's a sort of dark browny-green, not slimey. So I let the tank lapse, unsure of what to do. I decided to clean it up a little this weekend, cut a lot of affected stuff out and planted a new plant. New plant has been in there 2 days and already showing signs of getting that browny-green stuff on the edges of the leaves!!!
For those of you who use Excel in your nano tanks, do you follow directions? Or do you add more / less? Why isn't it as good as the DIY?! Should I just forget about the Excel and put the (big) bell back in there?
What kind of algae is this greeny-brown stuff?
Do you dose other nutrients regularly? I never added any other nutrients when I had the DIY going, and everything was going swimmingly!