Once the stains are lifted, your best best to REMOVE the iron, rather than to RE-STAIN the pool (because all the iron is STILL in the pool; just dissolved in the pool water) is to use cal hypo ONLY in small, increasing doses, so that you gradually raise your chlorine and pH levels

NO TABS; JUST CAL HYPO. If you put tabs ANYWHERE in the system, you MUST stop with the skimmer cal hypo!!

In an earlier post, PoolDoc said to not add tabs to my skimmer and just use Cal hypo through it. Should I take the tabs out and add a small amount of cal hypo, or just keep them in and monitor the situation?
Yep, I didn't say it just because I like the feel of of whacking away at a keyboard!