a little help if pos ?

piks at 6 weeks into flower doing 12/12 with 600w light was using vitalink

using dutch buckets started just using water as im on week seven now

could anyone have a look and tell me if im doing things ok the leaves on the top are going yellow

this is my 1st grow and any info would be appreciated

they look perfect to me man, keep it up............

Check out my Grow
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hey thx for taking a look is just using water ok to flush the nutes out ?
will my buds thicken up ?
and shall i just chop at 8 weeks is there any tell tale signs for the chop ?

Use only water to flush
Buds will thicken up a little more.
get a powerful magnifying glass or a pocket microscope or jeweler's loupe. Check the trichomes (crystals) for cloudy/amber ratio. It's personal taste but I harvest when I see 60% or more of the trichomes have turned amber.