Should I be concerned about the curled tips on som...

Hey @M_A_B, if you are moving to RO water it wont really effect nitrogen levels, that would be from your base nutrients. It does look like you are going in to N tox. With RO water you need to make sure you are adding calmag and that you are pHing it after adding calmag. RO water has basically nothing in it apart from water molecules - not only can this strip nutrients from your plants (osmotic action) but you cant ph it without adding calmag to say 150ppm as it can damage your pH meter too - if you tried pHing raw RO water you need to recalibrate your meter. If you are using synthetic nutrients, plain water to runoff for a couple of waterings and see how she is looking, it should calm down quite quickly. Hope that helps :)

I don’t see the curled tips you’re referring to but at this point in flower cutting nitrogen is a good idea but I wouldn’t go straight water unless you’re confident your substrate has plenty of P&K. If not, feed with bloom nutes mainly for the next few weeks. Low N and higher P&K