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GFO question

I was setting up a new gfo cartridge and forgot to catch the first water that came through. Definitely got some into the sump and of course into the tank. How bad a situation is this?
 
Don't make it a habit, but no big deal. Everyone that runs gfo has some in their tank. I have read that gfo grinds can raise iron content in the water which can cause a little algae.
 
I'm hoping that cause my reactors drop into a pre sump that has 3 compartments one with water. One with cheato and one with my skimmer in it. Very slow moving. I hope it mostly stays here .... Increased alge in this area wouldn't be a prob. I could clean it And it runs ultra slow. Set it up this way to ensure biopellets effluent are run through skimmer
 
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