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generally need a picture to do much to ID a problem

ive had this happen on tons of grows/strains and never noticed anything bad come from it. Dont over think it.

i used a even weaker pump designed for fish tanks with a 15ft hose for years with no problems, nutes and such may ruin the pump over time but it will work just fine i think.

Yes

better to just go 15 on 9 off if u want to save energy

Yes, you will want to put the fan up there sucking the air from the room, that is the exact setup i have done every time. Good luck

u are fine. Unless someone was smoking next to you and you inhaled secondhand. You cannot get thc into your bloodstream through direct contact, aka touching it.

if it is your own attic, not a shared attic with another dwelling, i would use the attic as long as the attic has a passive vent of some kind, or you may make your entire house hot as fuck.

what he said, OR over watering. Not heat

600w HPS should yield you from 8 oz to 1 lb. You got such shitty answers because ur question sucked, light power is the #1 component, plant size and growing method are not nearly as important. Give a stupid question you will get stupid answers from RIU.

probably nothing to worry about

I misunderstood the op's question. The answer is very simple, no, you are not better off giving the plant a broken up light schedule instead of 16-24 hours of straight light. If you have no energy savings, no heat issues ect, there is NO REASON to give a plant less than 12 hours of light...

oh i see what you ment. Ya you are probably right, a plant will grow in veg about the same even if the light is broken up.

Yes, as jodon said you are completely mistaken. A plant will not flower on a 6 on six off schedule even if it gets 12 hours of darkness a day. I have kep[t a plant in veg by putting it under a light for a total of about 5 hours a day as long as you break up the dark periods with about an hour...

i have no doubt a plant will grow on your schedule, but i feel it would be more ideal to just go with 16/8.

looks ready

that looks like no big deal, dont over think it. Definitely NOT nute burn. 1/4 str should be fine maybe even too little for those plants, but they look healthy.

i think with an adequate passive air intake a 720 cfm fan can cool your tent. I have cooled 5x 1000w's with 1 8" vortex fan.

It is better to have fan at the exit not the entrance IMO. Centrifugal fans suck air through ducting much better than they push it. Just my 2 cents, and mushroom filter is what i have used in the past.

im under the impression tons of people use epson salts and that it is the same thing as cal/mg, feed it with some N tho, should be fine.