Help diagnosing a problem

pjm275

New Member
Strain: Northern lights auto
Medium: 2/3 Fox farms ocean soil 1/3 perlite
Water: every 3-4 days
CFL 132 watt grow light.
Age: 45days old
Nutes: just used tiger bloom (1/2 dose) for the first time last watering 3days ago
Ph: 6.8-7

Some leaf tips curl up, others curl down. Some lightening/yellowing on the edges and tips. Any suggestions on what my problem may be?
 

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