If your worried it's not getting enough iodine, you could feeed foods high in iodine to supplement it's needs. It's safer, cheaper and easier than dosing and testing IMO. Feed foods high in iodine like shrimp, crab, lobster. Many commercial frozen brands contain 1 or more of those things. Also keep up w/ PWC's as said. Leaving the shell on shrimp may help as well, as that's where most of the iodine is and anemone's don't seem to mind it.