Oh I see OG thanks for clearing that up. What I really need to worry about is a reflector for the light I think. Tomorrow I will go and check a hydroponics store near me, I heard they have stuff called reflective mylar that is really good.
TKOS the plastic appears clear enough, but I guess that really doesn't mean much. I don't think it will block much light though.
With 2 watts per gallon I'm planning on growing plants like egeria densa, dwarf sag, asian ambulia, and hydrocotlye leucophelia. I will need all the light I can get but am not that worried about the acylic after what I have heard. Also, it will be supported on all 4 sides and will only be 12" wide so I think it won't bend or warp much either.