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I did a crude test with iron saturation in my tank.
I have no means to measure iron in the water column so I'm assuming it was low since I run large amount of carbon in a canister and replace it often.
It was time to replace the Rowaphos GFO so this time I skipped all the rinsing I normally do and disconnected the carbon canister for a week. The water got hazy red with microscopic iron particles so there must have been a huge iron spike lasting for some days.
An effect on the dino population was not noticed.
I think this shows that dinos are not affected with iron saturation levels from verylow to high, but levels from verylow to zero remains to be tested properly. In the past I have done tests with large amounts of carbon without any change to the dino population so one may think very low saturation level is not a factor.
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