Hi so I finally got my stand set up but its the middle of winter so i cant go and wash stroebought sand. I am going in a week or two to go and collect some stones from a clean river because its so much cheaper than ordering, I was wondering if i could also collect substrate there. The river should be in the low 30's due to it being in new hampshire and it beging fed by moutian springs. If I did collect the substrate could I just put it straight into the tank or would I still need to wash it?