Gabe, How did you take that pic with the just the blues? Everytime I try, the blue drowns out everything.
For sand, I've added sand by
(a) take new sand, rinse as much as you need too
(b) wait until it's dry. Took more than a month for me
(c) by a cheep automotive funnel, cut the bottom off, and glue it to a long piece of PVC (1.5' or wider)
(d) stick the tube in and poor sand in, it will settle to the bottom of the tube, and as you lift, it will start to flow
(e) lift and lower to start and stop the flow.
I found this to make as little mess (cloudyness) as possible... Good luck