Well, you seem to be on your way. Your tank sort of tells you how much light you can safely push. Understand that the more light you give, the more the plants will attempt to grow and demand CO2 and nutrients. If you can't supply that (usually inadvertently of course), then the plants will grow poorly and algae will pop up. So really, I'd let the CO2 flow for a while and see how the plants respond and if the algae falls back. If it does, then you can bump up more light. If it doesn't, then you know you need more CO2 or nutrients .. or both.
Some thoughts on your stuff:
Some people work with diffusers pretty well, but sometimes, you may find that going with a reactor will give you better CO2 saturation.
By Seachem line, I hope you mean the separate flourish lines like flourish nitrogen, flourish phosphorous, etc? Or their aquavitro line? Because flourish comprehensive is anything but.
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