I haven't had much luck getting R macranda to grow in my Laterite/gravel/DIY CO2/3 watts per gallon setup, so I thought I'd try potting it using a soil & micronized iron combination. Can't remember who recommended this in the past. My questions are: Where does one find micronized iron? Is Ironite (available at a local nursery) a good substitute? How much should I use? TIA, Ken