TA and Calcium have little to do with algae. Actually, nothing. The risk of too high TA is of scaling, cloudy water (if CH is too high) and possibly pH that cycles up rather than down.
If you were in a vinyl pool I'd say do nothing but watch TA to make sure it doesn't pass 200. But with a concrete pool you should slowly start lowering it. Lower pH to between 7.0 and 7.2 (so you can continue to swim). This should lower TA somewhat. Then use aeration to raise pH back up. Splashing kids, a fountain, even pointing the return at the surface can do it. When pH rises to 7.5-7.7 or so, lower it again to the 7.0 to 7.2 range. TA should come down again. Aerate to raise pH and so, ratchet your TA down until it's in the 80-120 range.

Carl