[Myka]

Your tank is still in its infant days and so are you as far as reef keeping goes, so losing some SPS (especially stag-type) isn't unlikely. I think you should focus on the fact that you're able to keep Monti cap so far, and be happy about that achievement. Going from Montis to Birdnest would probably be a better way to progress rather than jumping straight to stags.

Btw, your nutrients are undetectable, but it depends on what type of test kits you are using. There are more sensitive kits out there particularly for phosphate (Elos has one, D-D Merck has one). What kits are you using? Low nutrients is not a problem for SPS, rather a good thing. Ultra low nutrients (aka ULN) could be an issue for some SPS (definitely an issue for LPS and softies) and you actually can starve them, but you would need to be carbon dosing in order to achieve ultra low nutrients.

People commonly keep SPS in tanks with alkalinity ranging from 7-12 dKH, although 8-10 dKH is more common. Brad's a bit "abnormal" (hahahaha) at 14 dKH, but if he says that's where it likes to sit then sometimes it's not worth fighting things. Higher alkalinity has some bonuses, like helping to keep many algae at bay. Keep in mind though that calcium and alkalinity should compliment each other, so if alkalinity is high calcium should be high too. If you check the link in my signature that mentions parameters I posted a chart that explains the appropriate, complimenting levels.

As far as terminology goes, "bleaching" is usually a slow process where a color gets more and more pastel. RTN is rapid tissue necrosis which is something that usually happens overnight, and almost always starts at the base and goes up. If you catch RTN in the middle of the event you will see the skin falling off the coral in little pieces (sometimes fairly big pieces). STN is slow tissue necrosis which happens over several weeks or several months and can start at the base or the tips. You won't see the tissue falling off because it is going so slowly that the tissue just dissolves unnoticed.