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Around two weeks ago I bought a cluster of ammania gracilis and have been dosing 2 ml of iron everyday. However the plants have turned a greenish color with a little bit of red. I have gotten new growth that seems to be a bit more red but nonetheless still has some green. Also the older leaves are turning a brownish black, I know it's not ammonia burn because all of my other plants are fine. My tank is heavily planted it could be the iron is getting consumed fast and I'm not maintaining 10 ml of iron in my 20 gallon tank.