Picked these up this evening and got them cleaned up to see what I can do with them for the scape tonight. Tested them all with a drop off muriatic acid to see if there was a reaction and none of them reacted. Cleaned them with the hose and a tire brush and then soaked them in a bucket of water twice for 30 min at a time. Got them drying now and will blow them all off with the air compressor to remove any loose debris that may be left. Going to try to make a heavily planted river bottom I believe