As the title says, I have what I feel like is a slightly bizarre case where I can not seem to reduce Iodine or Aluminum with water changes or media use. For example, my Iodine levels spiked after several weeks of dosing, and they have now been stuck at 181.7 µg/l after 5 or so 30% water changes and of course a complete halt on dosing. Additionally, I was really hoping that the small amount of AI showing up in my ICP test was the cause of my soft coral issues. However, after two sperate 30% water changes and a heavy substrate/sump vacuuming along with two weeks of running PolyFilter and Cuprisorb my latest ICP test showed an increase in AI from 15 µg/l back to 25 µg/l which oddly enough is where it always seems to find balance (level wise) when I look over my ICP result from the last year. The one lingering doubt I have is the fact that I have 1.5 gallons of Marine Pure bio balls in the sump both in an active and passive filtration setup. Just because, I am going to remove them completely and re-test in a few weeks. I was however, curious to know if there would be a more common and perhaps easily overlooked reason why these levels would not reduce even with lots of water changes if they were not being introduced through food or dosing?
Thank you!
Thank you!