does any one know what this could be? [attachment=o206259]

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my problem is this some of my leaves are canoeing and twisting as in pic also the leaf edges (pointy bits) are curling up growth still seems good also will it affect my yield? my set up is as follows...

hydro nft
light 600w hps
ph 5.5-6.0
temps lights on 23c-25c
temps lights off 18c-20c
nutes ionic grow at 1200 tds/ppm
ventilation 2x 5"rvk's extraction and passive inlet
humidity 60%ish
space i am useing is 3ftx5ft of a 3ftx8ft cuboard with 7ft headroom

strain is pure power plant 4 weeks into veg

thanks in advance for any help from anyone
johnny123 Reviewed by johnny123 on . stinky please help does any one know what this could be? my problem is this some of my leaves are canoeing and twisting as in pic also the leaf edges (pointy bits) are curling up growth still seems good also will it affect my yield? my set up is as follows... Rating: 5