1. either this weekend, or next weekend. I don't like going more than 2 weeks without a w/c. Since you have CC
, you can vac it a little, but not too deeply. Just get the detris.
2. not familiar with power-glo's. its probably fine though.
3. one 40w tube isn't enough for an anemone, not even a BTA. And certainly not until the tank has been up for at least 6 months., preferably 9 months.
We'll need to know more about the size of the tank (please give dimensions) before we can say what the best lighting choice would be.