Stop spot feeding it for one. Also depends on what phyto you are feeding? With most of the posts on here as you can see, I like Reed Mariculture (leaned that way over the last month). Basically a good nanoplankton, microplankton and macroplankton. Two Little Fishies makes a product called Zoplan (or however it's spelled), that has an amazing variation of all three planktons - I've been studying that food A LOT over the last 6 months or so.
Other then that just try to keep your water parameters decent, the amount of lighting it is getting, good, and keep your temp stable. You can kind of only sit back and wait. I don't see any reason it WOULDN'T make a turnaround and go back to normal though.