Wedding Cake First Indoor Grow

So this week was a busy one, tying the branches to keep them from falling over/drooping, really should have had an extra trellis handy (next time I suppose). Also, notices a couple of leaves starting to turn yellow and one or two leaves developing very fine brown spots down the middle- did some reading and arrived at micronutrient deficiency, most likely zinc possibly also magnesium, so game them some micros, some extra calcium and bloom as well (the bloom was scheduled). Hope that helps, they are starting to fatten but need some more weight- will see how it goes over the next week or two. Also never quite determined why the very tips of the leaves turned brown (just on the tip, leaves looked healthy otherwise through most stages of the grow- besides those tips??)- could be the higher temps??