Looking good and very creative with your use of materials. Since you're using sand, you should probably place some flourish root tabs in there. As for the light, you should get the dual 7000K. The one im using has two strips of 7000k and it's super white and bright. If you get the 7000k/10000k combo, it might look very white almost blue. The "k
" numbers just stand for the light temperature as in color (not heat) or intensity. Closer to the 6000k range mimics the sun and it's suppose to be most ideal for plants. Even so my fixture has dual 7000k strips, I hardly detect any warm color in it... Like i said, it's very white compared to my PC
florescent lighting of similar color temperature.
I think the seller on Amazon must have sold out of the dual 7000k ("DS" model). You can buy it directly from their site at http://www.aquavibrant.com/index.php...ual-7000k.html
or message them on Amazon about it if you prefer to buy it there through them. If you have an Amazon Prime membership you may benefit from buying on Amazon.