Go with ADA aquasoil if you wish for a darker substrate since they are much better than those taiwanese knockoffs. CO2 is best turned off at night if you do not want issues with CO2 overdose. Growing plants takes some reading up and the folks here should be able to help you.
Since you don't have time to do water changes anymore....unless you are going to do up pipings for easy water changes, you are better off doing the non-CO2 method. There is an article in the forum on that method by Tom Barr or you can pick up Diana Walstad's book.
Regards,
Peter Gwee
Plant Physiology by Taiz and Zeiger
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