Ah, got it. Ok, let's see how she does at only 12. You may have issues down the road, but sending good vibes bro. As Kap said, upgrading the pump is a must. The stock pump is shit and loud. My waterfarm's are modified and the first thing was a high output pumps (min 40-60 gal), dual output (to feed airstone in res).
Will be following your grow to the end brother.
My opinion is though that your screen may to extreme on the vertical plain IMO I would vary the outer edges no more than six inches higher than the center height for ideal light spread. This is just an opinion though.
<...snip> ...but sending good vibes bro.
Lol jeans ha ha ha lovin the Avi lol