Yellow Tips! Brownish spots???

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Just got back from amsterdam, leaving the plants in my friend's hands for 7days... The 4th plant (Easy Ryder) was dried so hence the droopiness...
Most of them are doing alright, just this one plant who has yellow leaf tips and having spots as you can see.. Not too sure how to Diagnose this girl...

3x Red Dwarves
2x Easy Ryder

Cheers!

the spots are from your mate watering the plant and a lil splash back could of got onto the leafs which causes burn this problem has alot of people mind boggled when it happens to them... my guess is that the yellow leaf tips are from the concentrate of nutes going into the leafs causing a nute burn spray the plants with some water no nutes should be ok in a few days