Determining problems of whatever kind is very challenging due to the unusual pink color of the images.

You're likely to get better info from folks in the Hydroponic Forum

http://forums.gardenweb.com/forums/hydro

Some of that looks very similar to aphid stress I had least year shortly after planting out. But it's hard to tell with the color shift. If you only did one treatment, it's likely that you didn't get everything, the Neem especially needs to be done on a recurring basis. I tend to alternate with the soap and then Neem 2 days later, repeating the cycle for a couple of weeks for my indoor houseplants when I see a buildup of aphids or mites. Don't know about the power of those grow lights but one of the things the Neem bottle says to look out for in outside use is burning the plants by spraying them in the high sun. Could that be a factor here? Or maybe could your treatment have been too concentrated? The soap especially needs to be pretty diluted.

Can't help you with the nutrient side except to say to peppers don't need or like all that much nitrogen, and that aphids can be attracted to higher N levels. But seeing as hydroponic is a whole different thing when it comes to nutrient balance, that may or may not apply.

Can the mods please move this thread to the hydroponics section? Thanks!

You'll most likely need to "move" it yourself.

Copy and paste the test to the Hydroponics Forum.

And then add far fewer images, only those which illustrate the problem you are trying to resolve. Or simply add a link back to this post.