The oily sheen, yes...the tubes and larger pieces, no. I wonder if you got a bad container. Mine were in 50# bags from TSC, not containers with lids.
haha I considered using a cat litter container, but apparently it got washed out with soap, so that was a no go.Ahhh...gotcha. I have 3 cats, so buckets are never anything requiring purchase, ha! :hihi:
+1I would just use it.
+1 heres a photo of the 33long i am working on at the momentThink of it as extruded glass, and the weird shaped parts make more sense. I see some similar things in mine if I look closely, though infrequently. My GUESS is their manufacturing process may be a bit inconsistent, after all it's aimed at sand blasting not esthetics. I had no issue with oil, in fact I suspect what people see is extremely fine dust that floats. Had a fair amount of that, I just washed for a few hours. I find a continuously running hose best -- just poke it around in the sand, let it overflow and the floating stuff goes away faster.
I've had my first black sand tank going now for 9 months, I don't regret it at all. It is FAR easier to plant and replant in than gravel, and the plants seem to love it.