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try this https://www.rollitup.org/view.php?pg=faq&cmd=category&id=63

i'd say don't stress them anymore

you're good to go

since the days are less than 12 hours right now your plants probably are on the road to flowering already, but i've never seen anybody do this so you get to be the pioneer and report back on how it works out.

the air temperature guidelines are given for a thermometer at the height of the plant but shielded from the radiant heat of the bulb. the radiant temperature guideline is used to keep the leaves from burning and is done simply by using your hand at the height of the plant. then you lower the...

your plants are just fine. the white hairs are called pistils and eventually turn color on all weed plants

totally a personal choice. veg longer and get a larger plant and larger yield or flower now and get bud sooner.

replace the fan if it keeps smoking box must be light proof keep soil moist but not soaking wet for the first week. then start a regular watering schedule where you let the soil dry out before watering. not much of a jump in electricity - about 60 cents per day. fire hazard depends...

they'll go back into veg unless you manually cover them for 12 hours each day

even so, i don't understand how you keep the flowering area completely dark with that set up.

patience - i'd bet on 4 weeks

adding soil is the exact right thing to do.

pH meter is critical as off pH causes nutrient lock out that looks like a lot of other problems. as long as a leaf is alive it is helping the plant. i pull gently at the leaf and it will come off if its dead. if you mean the brown edges of the leaves that could be slight nute burn but...

your young plants are definitely stretching because the lights are too far away. you put your temperature probe at the top of the plants but shielded from direct light

don't think it's calcium (from rui plant problems and cures stickie) : Calcium Deficiency: Young leaves are affected first and become small and distorted or chlorotic with irregular margins, spotting or necrotic areas. Bud development is inhibited, blossom end rot and internal decay may also...

there are two groups on rui - the pruning camp and the do nothing camp. personally i let the plant grow as it wants except for topping and fiming.

sure you can vent to your house's hvac system. whether or not you do that you need to do something for smell control. it sounds like you haven't been through a flowering cycle but those plants are going to smell up your whole house if you don't do something. even though you're legal you...

doesn't really look like nute burn. have you checked pH? also, what is your watering schedule?

trying to help - what kind and how much light are you using? - edit - ok, this time i read the title. your large plant is too far from the light and is stretching badly. you want the light as close to the plant as you can get without burning your hand when placed at the top of the plant. then...

looks like too much nitrogen