I'll post my pic's if you post yours. LOL

Like said PPM's are low and PH is high. Should be 5.2 to 5.8.

About the A/C, is it blowing right on the plants or over the top of them. Cold can turn stems purple.

I pushed my bro in law into the water cause he kept buggin me. It was the only way to see if he could swim. First time I have seen anyone drowned in a ten gallon tub but he did it. He kept mixing the lucas formula backwards no matter how many time I showed him. LOL

You sound like most all things are running good. You just need a little back up. I think we have all been helped and will help. Fill out the trouble form and show a few pic's and all fears will be put to rest.