[shiftline]

So filter floss is for mechanical filtration. Do I need carbon in the tank?

I have a RO system that has 2 carbon filters so it should take a lot out of the water.

For salt I was thinking of going with the reef version of instant ocean reef crystals since phosphates and has calcium nase trace elements to keep corals happy

I generally avoids additives and extra chemicals if I can since I think knit just buffers with your water more and could potentially add to swings I parameters. (That being said I have an auto Dosser I built for a planted task if needed)

Do u think I would still need gfp to get rid of phosphates with the reef crystals? Aka does it come from things in the aquarium of just the water?