You can use both of those (perlite and vermeculite) but I'm not familiar with them so perhaps MVP or someone could help you with the medium part. When I was trying to decide what medium to use my hydro guy (who knows me well) suggested I stick with either hydroton or the higromite rocks. One thing he mentioned about perlite and vermeculite was the mess involved. Anyone who uses it think its messy?

STAY AWAY FROM ROCKWOOL......for my sanity if for no other reason.

And Rock....I wouldn't take something out of dirt and put it into your system. There's all sorts of germs, bacteria etc in the soil that will really get out of control in your hydro system with its perfect conditions for things like that.

Plant a new seed for your hydro. :thumbsup: