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what brand/kind of thermometer that i can get that would turn on fan at certain temp?

hi guys i'm planning to grow hydro and i was wondering how long am i suppose to submerge roots for in water? and i will be using mh and hps lights will that burn my plants? thank you for your help!

whats the beset way for me to keep it cool? use an ac? and if i'm going to do hydro how long do i submerge roots for?

hi guys i'm planning to use my 6x2 close space to grow half use for veg other for flowering i was wonder should i use both mh and hps for veg and flower or mh for veg and hps for flower? also if 400w is good enough since i'm only doing small scale of 6 plans at a time and how many w for mh? my...