Dorogaya maya... there are many strains that will naturally have red stems but your strains do not. The red stems are quite pretty BUT what they're "saying" is that they are quite stressed - and the drooping leaves are saying the same thing (you only have 2 plants that are drooping now but the other one will most likely start doing the same soon). I've looked at your diary and can tell you the problem is most likely the pH level... it's much too high and needs to come down to 6.0-6.5... Since you haven't been giving them any nutrients, I'm not worried about any lockout issues... ONLY worried about the pH... if you can get that under control, your plants will be able to take up the nutes you are now giving them. If you don't have one, invest in a pH pen as these are the most accurate way to measure... but even the drops or the strips will help...
Ydachi!!