Yes to adding some cya. In the meantime, watch your cl closely or you'll end up with another algae bloom. Do the best you can with the brushing. You can only do what you can do. Ideally, you should maintain the high cl level until you no longer have a CC reading. You didn't say what type of kit you have, so you may not be able to test for this. If not, then I would just suggest maintaining the high cl readings for at least a couple more days just to be sure you got it all. Then, you can let it drop some. I would also suggest adding just a little Borax and bumping your ph up to about 7.4. If you maintain your chemistry, you shouldn't have any further problems. Hope this helps.

Watermom