Blimey, Greenthing, he did provide all the same info, just not in bullet point format.

But, to make things easier I would fill it out like that, Leafy2.

It does seem like a light bleaching thing. They start to stretch rapidly in those first couple weeks of flower and sometimes we can forget to adjust our lights up accordingly. The waxy feel being on all of the plant may be related to something entirely different. I wouldn't think that excludes light bleaching as a possibility. With the damage starting at the tips and the burns on some of them I wonder if they are being slightly over-nuted too.

You are using good stuff, I have BioBizz and CannaTerra pro soil as well. :thumbsup:

I wouldn't bother with the brita filter. Tap is usually fine and can actually provide some necessary minerals. Actually, that makes me wonder if you could be missing some magnesium. A few of those leaves look like they could be showing first signs of Mg def. Have you given them any epsom salts? (Magnesium sulfate) If not a couple weeks into flower is a good time to do so. One heaped tablespoon per 10 litres of water, or 1 teaspoon per 5 litres, if you prefer. You don't want to over-do it with that or you can lockout other nutrients, but if you've never given it to them it should be fine and may help.

This is only my newbie take on the matter but it's a start.