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Sorry I'm late on finding this thread but your tank is beautiful! I've been working on a 5g for my husband's work office for months, hoping to be done and move it in the next few weeks. How large is your tank?
CO2 runs 1 bubble every 3 seconds 1 hour before light goes on, and 1 hour before light goes off. However, during this period, CO2 was on the whole time.
I might increase the number of ON hours to an extra 2 a day for a while see if the red continues.