I stopped diy co2and excel with no problems. Only have a few stem plants left but I have fallen in love with crypts and anubias. You can check out my thread and see when I stopped co2 and see I had no issues. I didn't change lights but found I definately needed a full cover of floaters to prevent algae. I tried messing with light height, duration, one light on one light off, siesta period, and a 3 hour high light(both lights on) with the rest of the time being only one light. Full cover of floater, duckweed and water lettuce was the only cure I found.
If in doubt, add more plants!
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Last edited by jeepguy; 08-17-2014 at 03:04 AM.