Mother Plant Getting Spots Help Please!

I have a 71/2 week old mother clone from a indica-strand unknow growing in coco coir 4g pot.Feeding coco A & B 10ml each per gallon, Rhizotonic 4 ml per gallon , Cannazym 4-6 ml per gallon. Tap water used after sitting in circulator for 24 hours with oxygen stone. PH tested before adding nutes is 6.8 too 7.2 after adding nutes its 6.3 then adjusted too 5.8. PPm before nutes is 810 too 950 on Hanna meter after nutes its 1105 too 1250 which is a question. I feed every 3 days and flush every 7 too 10 days with a 5ml wash of canna A & B was told not too use straight water also a question. My temp is at 80 degrees F' humidity is at 18%. Growing in closet 5'x6'x30" using 2-6in 50cfm one intake one exhaust. 18" fan as well. Running 400w hps and 125w cfl hydro-farm side-lighting. I started noticing these spots on some leaves not all and not new growth any assistance on what the problem is would be appreciated and any suggestions on set-up is also helpfull my 1st grow indoors .
She does look good doesnt SHE?
Pictures are not VERY good sorry my Mother-in-Law has my camera in another country
Any questions in diagnosing this issue please advise!!!

They look fine just keep an eye on them.

youre feeding the plants once a week and flushing every 10 days????why.....your plants should be waterd once no more than twice a week beacause you want the roots to spead insearch of water this prevents the roots from becoming locked an one ball which will happen if you keep feeding like you are.....and i think the only time you should be flushing is if theres a nutrient problem i think you may be stressing the plant...as for the spots it may be some minor light damage,....you should stop using tap water tho,...