there are automatic PH and automatic nutrient machines.. they are called dosers..

American Hydroponics and others make them.. They are freaking awesome

A pump constantly brings Resivoir water past sensors which constanly check the PH and PPM.. when it gets off a bit, the doser drops a little Nutrients or some PH down..

They are NICE!!!!!!!!

Turtle, even you could grow succesfully if you had one of these!

i love you