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Actually they don't change color from lack of O2. They look like this: http://www.growweedeasy.com/overwatering Good luck

I think I read your description wrong...sorry. Just add another air pump and air stone to your reservoir to increase O2 in your solution. Good luck.

If you don't have proper drainage in coco and you're watering too often, you can have over watering. Let them dry out and reduce your watering/feeding schedule. Or, Add more perlite or hydroton rocks to your coco to air it out more and allow more drainage. Good luck.

Not calcium. Calcium def. looks like this: http://www.growweedeasy.com/calcium-deficiency-cannabis

Seriously took 10 seconds typed into a search bar. Good luck http://www.ilovegrowingmarijuana.com/the-difference-between-regular-feminized-and-auto-flowering-marijuana-seeds/

http://rollitup.org/t/omsco-seed.919291/

Iron. Zinc looks like this: http://www.growweedeasy.com/zinc-deficiency-cannabis

Then I have no more excuses for them. That's just crazy.

I'm gonna guess that you're not in a legal state and said something to tip them off. It would be risky for them to sell to someone if they KNOW that that person is going to be using their products for illegal purposes and have the right to refuse sale.

How did they know?

Yeah it is and I need to get a filter. The hydrologic looks nice but pricey. General hydro's hardwater micro is for over 200ppm. I use that as a general rule. I usually don't need cal/mag. but yeah its getting up there.

No that one should be a normal read out up to 999 and then it abbreviates it I believe, so that might be accurate. I'm just surprised and a little jealous. I run tap at 200 ppm which is in my opinion the top level of hardness before using a filter.......Run with that stuff!!! :)

That's really low for tap. Make sure there isn't a multiplier on your tdm meter. Say X10

I finally see it. Yep red eyes. The BT should kill the larvae. Are you using a sweetener? Maybe that is helping attract the fruit flies?

IMO. Too much RO. Add calcium. http://www.growweedeasy.com/calcium-deficiency-cannabis. Good luck

I think you have to have made a certain number of posts before they give you rights to "like" comments. Also, BT is 100% natural. https://en.wikipedia.org/wiki/Bacillus_thuringiensis

Dry it out completely and then drench with the BT. Follow the instructions on the bottle.

Stop watering too. I bet the inside bottom of the soil in the pot is mud. Let that stuff dry out.

Looks like fungus gnat larvae and adults to me.

I am by no means an expert with co2, but according to that article, yes you should be ok.....