<a href=showthread.php?s=&postid=12447344#post12447344 target=_blank>Originally posted</a> by stony_corals
Do not dose KCl without a test kit... many reefers have reported issues when they OD'd on K... If your K levels are low, water changes won't do anything much unless you're only slightly low. How do you know that K levels in RC is low? Did you test?
I wouldn't take a lack of PE to mean anything on your M cap.... When zeo users reported issues with their M caps and found low potassium, what they found was that the coral was very dry and pale.
The only anecdotal information about Iron is a faded look to green corals, but if you have algae (micro, macro), these would probably stopped growing first due to Iron limitation. You have to be careful dosing Iron.... Iodide is the same way, there isn't a lot of scientific data to show the benefit, anecdotal include better blues in blue sps, and better health for xenia...