Will my sand still be safe to use after 5 years?
I am having a part gravel/part sand substrate for my new aquarium. We had an unopened bad of play sand in the garage so hopefully that side is sorted but ..........
.......... I have had said sand for over 5 years as we brought it when our eldest was young but never used it, she is now almost 9. When I brushed off the cobwebs (literally) and opened the sand it still seemed OK but maybe a tiny bit damp?! Not sure on that could have been my imagining it. Anyway I have put the amount I need into a large bucket and washed it. There was some scum which came to the top which was easy to drain off as it floated on the water, is this normal?
So is there any reason why this would not still be fine as long as I wash it well? Sand is inert by nature so as long as it is clean can I assume it will be safe for my fish?