What Happened?

Could really do with some advice here, as i have no idea what to do. I have 2 lowryder-2 plants, both about 7 weeks old. Well there meant to be lowryder-2 but not sure they are. To start with they had a couple of purple bits here and there. But i just checked on them and they don't look too good. They seem to be very purple not sure if its a strain thing or not? Cos seems to be everywhere on the leaves not just on the stems. So they have gone purple and brown i guess you could say, although the brown is mainly on the older fan leaves so that might be an age thing? They seem to be really brittle too, like the ends of there leaves will just snap off even on the new growth. Nothing has changed resently so i dunno whats caused it, any advice would be great. Thanks, pic below.

what are your temps? day and night? I think its cold myself

mr west said:

what are your temps? day and night? I think its cold myself

Click to expand...

Night time temps are about 65, maybe 60 if it's really cold.

Erm temps though the day are about 70ish. 75.

looks perfectly fine to me. low temps like that will make your plant think it is fall, hence the beautiful colors.

Oh, maybe me being thick but i'm slightly worried about one of them, i swear that a couple of days ago it was all frosty and covered in trics but wasn't quiet ready for the chop as it had no amber ones yet, but now they seem to be disappearing!? Is that even possible, its not frosty anymore and i swear the trics on it are disappearing getting smaller, well they look to be smaller than a couple of days ago though my scope. Am i just worrying about nothing here? Adviice please.