its most likely algae...You could try to cut your photo period (amount of time your lights are on each day) back a little..
Its hard to grow clean
Another pretty awesome shot!
I got some crappy Sigma lenses.. Need better ones. someday maybe...
Sounds like an awesome find! Lucky!
SnakeIce, what do you think was your biggest challenge?
Royws3, I just looked it up and for 50 lb. it's only 2$ more, I can handle that
ah...then you know...
i had to buy a step ladder, the stand i had built was ~ 34" high
beautiful setup to stand and look