Clowns are not depressed without an anemone. Maybe a mate would keep your clown occupied, the interaction would be interesting. I have 5 bta's in one tank and 5 in another, 3+ yrs never lost a fish or snail to them. Most of the more difficult anemones will require more lighting than you have. Hoestly if you don't even know how many watts you need to look at your fixture, it will only take a moment.
100 is not enough to keep an anemone in a 46, 200 would work for a bta, they are the least demanding of all the host anemones.