Do they look healthy?

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That one needs some food otherwise yes they all look great

Which one need food? I'm giving quarter strength big bloom

I'm not sure but is something eating your leaves in the first pic?

You should give some more details like:
What are they planted in? soil? pot size?
How old are they in days from seed or cut?
Are you feeding them anything? (edit i see you sid 1/4 str big bloom)
Lighting details? if not indoor, what sort of climate are they in?
strains?

for starts

The smallest one looks like it light green not sure if its just a bad picture or not though.

Ww x big bud , Delahaze, money maker, all female 2 regular afghan #1. Led 400 wat full spec. 2 shit Floris. Temps 77-79 lights on 74-76 lights off humid 40 %

I do have t5 four 4 foot 2 6500 and 2 3000 on the way. My room is 4x2.5x4.5 high

I have 171cfm hurricane fan and a fan blowing inside room

I'm using organic mix with 40% perlite. Fffert. 5 gallon pots. And afgan #1 earoponic roots look great.

They are three weeks old

they look pretty great man, as the other guy said, the plant in the second photo is a little small and pale and could probably go with a tiny bit stronger feeding next time but they look pretty good at this stage nice job

Can someone tell me a little about a ppm meter? I'm not sure how to use it. I measured my water it reads 200 ppm if I need it at 400 ppm with fertilizer. Do I take it to 600 or include to 200 ppm to make it 400¿ does this make sense?