there were several black grains (rocks is more like it) but they were few enough where I was able to hand pick them out once I had the sand layed down in the tank.. My sand otherwise is not sharp at all. very fine grain. looks like sugar.
Now the issue I had and the reason I took those pics is obviously the sands I got from the same company labelled the same were two different sands. It could be just a color difference or something significant, who knows. Having used quickcrete before which looks even worse without problems I made the dicision to go forward anyway.
Heres what people dont understand when they say I should have just spent the $100 on aquarium grade sand: this tank was set up from the beginning with the concept of cheap and experimental. I KNEW I was going to use play sand before I even made up a budget. I have a 50/50 base rock/liverock mix. I have a used tank built in 1988. I have so far one questionable non reef safe fish in the reef with probably another to follow in the future. if something doesn't work it doesn't work and will be changed. I COULD have easily bought aquarium grade sand but I wanted to know if Koloscape would cause any issues. I've only seen a few others who've used it since Old castle started supplying the Kolorscape brand. Old castle has been used enough in aquaria where it shouldn't even be questionable anymore wether its safe or not. If more people dont try Kolorscape who will ever know if its just as safe to use as well, which is why the color variation bares mentioning. If I just wanted to fluff up the pro's of play sand I would have never brought up the color issue to begin with (who would have known?):
my kolorscape thread .
Now if a year or three years down the road I run into issues I'll be the 1rst to admitt its not wise to use but until then you can rest assured I've heard enough people say not to use it that one more person saying it is mute to my ears. And you can see even in the old thread by no means am I trying to convert people into believing play sand is great or should be used.