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Looks like nutrient deficiency. You should've already been providing some about a week ago. Use something like General Hydroponics Flora Series, or something from Fox Farms. Absolutely do not use Miracle Grow. I'd switch up your lighting to 18/6. Lots of reasons. I believe plants need...

BTW, you want to give your little ones exercise, by using a PC fan, or a larger fan put farther away, to just make them wiggle a little. This will build up their stalks, and provides a lot of other benefits.

Oh yeah, she'll be fine. I like using toothpicks when they're small. I don't even tie them to the toothpick, but rather just lean it against the toothpick. You can use anything, really.

BTW, it's good to take your fan apart, every couple grows, and wipe it down. They can get a little dusty, and maintaining it will make it last longer. They're pretty easy to take apart. Just a few screws and some wire nuts. Take a pic of the wiring before you take it apart.

Nope, don't have to worry about that at all. Your fan will not be effected at all. Just connect your filter around the third week of flower.

You only need to use your filter when things start to smell, during flower. There's no need to have it hooked up beforehand. It'll wear you fan out more quickly, cause the fan to warm up, adding heat to the room, and waste electricity having to run the fan under load.

BTW, when you're vegging, you want your humidity above 50%. It's okay if you can't quite reach that. What'll happen is your plants will perspire, and they will just need more watering. During flower, you want you RH below 50%. I like it around 30%.

^^^ what he said Now, there are times when you should spray them, and that is when you apply pest repellent, like Dead Bug Brew. You want to do this just a couple minutes before lights out.

And I wouldn't spray the leaves at lights out. That's when you can run into lots of issues with mold and mildew. Spraying them during the day can cause your leaves to burn, from he light being amplified by the water droplets.

Yes. Plants perspire to keep themselves cool, and probably for other reasons.

Perfectly normal. A certain amount of light passes through the fans to the lower leaves. This is very dependant on the type and power of the light. What you really need to watch for is condensation between the leaves. This can happen when leaves sit right on top of each other. You get...

Those ice probes probably work okay for small setups, but anything larger will take a different approach. A couple other things to consider... Use a PC fan to blow on your water pump. This will really help keep it cool. The ice probes is a "heat exchanger", meaning one side absorbs heat...

Or even 2 x 600w over each area. Going full LED will certainly save on heat and electricity, but there's going to be a big startup cost. Either way you'll be paying, whether it's changing out all your HID lights every couple of grows, paying a couple hundred extra on your monthly power bill...

Look at those big ol' fans! Looking good!

I use a small PC fan to cool my water pump, and I have my tent exhaust fan blowing on my 70lpm commercial air pump, to keep that cool as well.

In the Winter, when I have my home heater on (heat I don't want blowing from my vent to my reservoir water), I just use a fan to bring in air from another room. I keep my house around 68 in the Winter, so that's the temperature of the air blowing on the water, as opposed to 60 degree air, from...

No. I use either my vent air, or air from another room, and have it blow on the water in the reservoir. Temps stay between 67 and 69. Check out my thread... https://www.rollitup.org/t/jbs-killer-no-chiller-eperiment.974837/

In the Winter, when I have my home heater on (heat I don't want blowing from my vent to my reservoir water), I just use a fan to bring in air from another room. I keep my house around 68 in the Winter, so that's the temperature of the air blowing on the water, as opposed to 60 degree air, from...

I've got a very cheap alternative, that always keeps my 60 gallon RDWC at 68, regardless of the time of year. Take a look at my thread... https://www.rollitup.org/t/jbs-killer-no-chiller-eperiment.974837/

I crank Slayer in an attempt to scare the trichs out of them! LOL! I've always got tunes going. Anything from Fiona Apple, Beck, and Gorillaz to Clutch, KMFDM, and Kyuss.