1. There is no need to use the lights during the cycle unless you want to use them for your own viewing. I don't do water changes until the ammonia and nitrite both go to zero. Diatoms will take care of themselves.
2. In my experience, even when cycling as Eric recommends, you have to fight the HA.
3. I run my sump. If you are using part of it to grow macro I would wait to add it until the initial cycle is over.
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