You'll be OK with the Emperor 400 and I'd leave in the biowheel.
Your lighting level leaves you squarely in the low light/low tech tank category, which does not require CO2 injection. (This means that you don't have to worry about outgassing CO2 since you aren't injecting CO2 gas to begin with.) With your current setup plans, the biowheel is only an advantage, not a disadvantage.
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