Transparent leaves

Hello all , Im a bit of a newbie I suppose
on my second grow, the first was done in a different system etc and a long time ago.

I have a few problems to ask you all thanks.

Im using a 250watt CFL light about a foot away from the propagator, hand feeding with formulex cf 12 and Ph 6. All seems well except the transparent look of the leaves. The plants are now in 3" Rockwool blocks
and have a great root system. They will be vegged in a flood and drain using sensi grow.
And flowered under 400 watt HPS using Optimum Bloom and Big Bud/Overdrive

1. my young seedlings look a little transparent - I have 4 Northern lights plants grown from seed in Rockwool with the intention of cloning.

Could the light be too close etc

2. If they have nice roots and are on the first set of 5 finger leaves can I transplant out into my flood and drain and water 3 times a day etc or is it too soon. At the moment they only seem to need watering every 3 - 4 days. - so 3 times a day sounds likethey would get over watered ?

Any hope someone can help - Ive no camera at the moment but will get access to one soon

translucent?

wow... hmmm.. never heard of that before.. wish i could help.. but ive honestly never heard of that.. it sounds kinda cool/interesting... i would love to see some pics of that!!

Pics? Please?

I had problems w/rockwool until I learned to condition them first w/hygrozyme .. but anyways you can control the drainage of rockwool. If they get too dry ,move them closer together or surround them w/clay pebbles or similiar.
If too wet, seperate them and set them up on top of another piece of rockwool or similiar.
If seedlings r light in color you may want to increase nutes .. try it on one ,you will see in a matter of hours if better or not.