Take a look.
Soil is ffhf perlite mix probably 15-25%perlite
Watered with plain RO water. Just got a better ph meter.250w hos light untill I finish the room.
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You don’t want to water with plain RO water you cannot use a pH tester in plain RO water there is no pH to it you have to add something in there a little bit of regular water or something to put something in it
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Should I flush with RO and cal mag? Or wait till they need water again?
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Looks like they are asking for some light… what are you running in there?
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The clawing down leaves look like possible overwatering in my opinion. You can drop your humidity also if possible by about 10%.
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Welcome to the community Grow Bro, a flush is used to correct the PH or TDS of the medium and I would assume it’s way to soon to have those issues. The larger plants appear to be a around 3 weeks above ground and seem to have put down a good root base. I would start a drench to drought routine in a week or when the plants have the 4th-5th growth node 
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Yes, i think its from over watering also. Ive done over watered many tomato plants in my day. You see how the leave looks bubbled up at the tips? This is too much water in the leave…
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