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FutureInterest;240595 wrote: Granular ferric oxide... rust crumbs/pellets. It can bind phosphates and silicates. I don't use the stuff though as its not needed imo... and it can be dangerous to your system if used improperly.
It's not needed, but it works great. But as Jin said, you need to do a lot of research before you use it. The best case scenario is to start using it BEFORE you add any stony corals to your tank. You also need to have a great phosphate kit that measure phates in the low range. If you acclimate your animals over months, it can be awesome. If you don't, they are toast. However, even with slow acclimation, some stonys can die on ya during the acclimation process. It won't effect fish though as far as I know, but then you don't need phosphate that low for fish either.