I'm using a coco perlite with Dr. Earth fertilizer 4-6-3. I follow the the company's recommended ratio.
I give about 200 mls of water PH'd at 6.5-6.9 about every other day. I try to do light watering because I'm afraid of drowning them. I keep the humidity at about 68% with the same PH water. I haven't done much of nutes. I was thinking a Nitrogen deficiency or CO2 defiency.