I really can't think of anything you would need to dose more of because of heavy skimming. Just keep up with your salinity since that can drop over time if you are pulling out lots of skimmate and just topping off with freshwater without ever checking salinity.

Some do say that heavy skimming will remove trace elements. I'm not sure I agree with that but either way it would be so minimal that it isn't something to concern yourself with IMO.