It looks like a ph issue to me but I'm not a soil expert. Check the ph of runoff of your soil......not just the ph of of the water you are adding but they BOTH should be between 6.2-6.8.

Revised: The Complete Guide To Sick Plants,pH and Pest Troubles - PlanetGanja.com
Weedhound Reviewed by Weedhound on . HELP PLEASE hello, im new here, but my plant is having some trouble. its starting to wilt and the leaves turning yellow/ small brown dots. im thinking it has outgrown the pot it is in, and maybe a nitrogen deficienty, but i just nuted them a new days ago, and was on straight water for about a week before that due to them looking over nuted. anyways ideas? im using a generic potting soil, and its been doing fine so far. here are some pics. I water with tap water sitting out for a day, ph is right around Rating: 5