It's about 6 months old. And I started AFR about 1 month in as I started getting more coral. Just LPS and softies.
Honestly I see this quite a lot with younger systems as I outlined in post #27.
Here’s what you could do. Keep your AFR, but hold the dosing for now. Switch over to Carbo Calcium or BRS Pharm 2-part as there are no trace elements in that from what I understand. Let your system mature a little more so that Iodine can come back down. Once your Alk consumption is moderate, maybe try to get back on the AFR, but monitor via ICP so that you can catch the Iodine if it starts to elevate again.