Yellow Tips, Droopy Leaves, Yellow Viens

This is my first ever attempt to grow, so im new at this. My plants are about 9 days old and I am using the Aerogarden classic. I am using distilled water and WAS using the nutrients that came with the AG. I only used the AG nutrients once. I noticed that some of the tips of my plants were starting to turn yellow about 2 days ago and my biggest plants' leaves have been droopy for about 4-5 days now. I thought it might have been nute burn so yesterday i emptied the reservior and attempted to flush them. They were in distilled water only for about 12 hours before I added some regular MiracleGro houseplant food. The pH is currently at 6.0. Is this nute burn or nute defficiency?

I would say the one with the yellow veins is a def. The one with the burned tip is just that...my 0.02 anyway

Please some more advice would be appreciated.

Drop ph to 5.6 use 1/10th strength nutes. They are a little young to show a def so if they are all on the same H2O then its most likely a burn. Also, ph of 6.0 is a lil high id get it down to between 5.3 and 5.6 just to be careful.

my plant is in flowering stage has good size buds on it n up until latley has looked great but now the viens r turning yellow n the leaves r also what could this b please help!!