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6x6 rockwool, covered flood table, seedlings

Hey everyone I had a question on my current grow. I have some seedlings(2 sets of leafs, 4 total) and they were in 2x2 rockwool cubes. Once roots a good amount of roots started showing on bottom, I put them in the 6x6 cubes. They have been in them for about 9 days now in the flood table with 2x daily cycles. I have also been doing small top feeding at that time.

Yesterday I put a black/white plastic cover over the table that covers the rockwool so only the plants/stem are visible. My reason was to prevent any type of alge that would form from any possible left over water. It looks like this:

20140709_203554.jpg

This morning/today the seedlings looked a little droopy and I was wondering if that could be due to over watering? Then I was wondering if its even a good idea to cover the cubes like I did because now they are in a humid environment and dont dry out as easy.

Is that going to be a problem? I was hoping as more roots developed they would help with moister problems by actually drinking the water. Though that is just a guess.

What do you think? Thanks!
 
Plants are droopier when the light is off and take an hour or so to get back on track.
I would worry about molds in the rockwool when you cut off the air circulation from the top, but I'm not a hydro grower and I don't know much about it.
 
Thanks for input! I was actually worried about molds as well so I cut the tarp to fit around the cubes so the tops are showing but the table is still covered. Hope this will help.
 
AS, the problem is the light from the top of the table, that is why im covering with black/white plastic. I havent even thought about painting the sides but that is an interesting idea because they are white and I bet light gets through.
 
You could use an aluminum duct tape to lightproof... everything.
The sides, the bottom, the top cover, whatever lets light in.
 
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