Poor lighting...
Bad water pH....
Poor Soil
Shock

DO NOT change schedule to 16/8...set at 18/6
Get a pH pen...adjust accordingly.
Get some new lights...real lights.... fulllighting spectrum.com (5500K)
Transpant into new soil...not anything with food in it. Especially Miracle grow

Curled leaves like that mean rootig problems. All of which can be fixed or adjusted with what I typed.