well so far the seedlings have been struggling. I checked the run-off ppm after a few days of no growth and overall yellowing-browning of edges. the ppm's were 650!! Woops. i have been watering with my tap which is 260 ppm, with nothing else added.
I think my problem was not letting it runoff enough. Was only watering until i saw it come out the bottom. Unless the Canna coco needed to be flushed first, but i have always heard it does not.

So i watered heavily with 1/2 tap 1/2 RO at 150 ppms, and ended up with runoff around 200ppms. I am hoping they recover. The first set of true leaves are real droopy I think i may germinate the rest of the seeds i have in case these all die.

What i have been working on now, other than trying to keep the seedlings alive, is:
Setting up my new 8ft x 8ft grow tent. I drew a diagram in the hopes that someone may be able to help. I tried to upload in "growroom design" but it would not let me, it said i am not allowed to post attachments? Anyhow here it is.
The reason i am concerned is because the window is huge and i am going to need to cover it(no light leaks), and at the same time use it to cool the air in the room the tent is in. I am trying to exhaust in the same room, avoiding cutting any holes in walls, hence the purpose of the tent.

Thanks peeps for checking me out.