Nirvana's Crystal help

Hello, i have two crystals from Nirvana that are about two weeks old.Their in a coco/perlite mix under 4 cfls. So far they have had one VERY light feeding of Sea Tea (2-3-2) with a little nitro booster.I don't know what the problem is but it looks like nute burn, but for reason i'm thinking a ph problem. I have kept it between 5.5 and 5.8.I have a Afghani thats doing fine but the crystals are not. Anyhelp?
 

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