Phalaenopsis gigantea - long term growing project

[desirue]

I just got a phal gigantea alba x sib. It has a leaf span of 17 inches and what I'm pretty sure is a new leaf growing (still very small though) It's also got good root growth happening currently, two of which I can visibly see through the pot (a 4.5" pot). It's currently in front of a high-light southern window, on a heat mat set to 80 F and also has additional led lighting. I'm a little weary of this one to be honest as I've read a lot about it and know it can be hard to grow. I'm certainly going to try though! Also, can I put lemon juice on the leaves to get rid of those spots? (which look like hard-water residue spots?)