Is this Magnesium/calcium def

Hello to all from a newbie. Asking if i am diagnosing correctly my problem.
Leaf on 5 week old AK47amp;nbsp; 1 week preflower Leaves showed signs at week 4. Plant moved 1 week ago into larger DWC unit.amp;nbsp;
IONIC BLOOM s/wamp;nbsp;amp;nbsp; pH 5.6 - 6.3 flucuatesamp;nbsp; at present running at EC 1.5 will up to 1.6 EC when first shows flower. then 1.8amp;nbsp; up to 2.0
tap water at 0 EC used,amp;nbsp; RW not accessable .
Cal/Mag started at week 5.
Plants under 600W HID Na
temp at night 11 to 14amp;nbsp; daytime up to 24 C
well ventilated and air circ.amp;nbsp;