yea, from my understanding was that i was supposed to give them nutes off the rip, in very small doses becaseu the minerals that are normally found in soil are not present in h20, atleast not the main 3, some micro nutes are in tap depending on where you live. i need to find a decent place to get supplies, ive been checking out indoor garedens a lil and they seem to have what i need. kinda workin on a budget so i dont want to get the digital tester, i do have a ph thing that tells me where its at, just no ph up or down.