If they came from a flowing river I would just give them a good scrub with hot water and lots of rinsing.
If they are covered in crap or moss or weed and you don't want to put it in your tank then give them a boil or pour boiling water over them.
Got a replacement heater this morning :happy2:
When I had the heater out of the tank you could see the wire above the un-coiling was coloured, under it was all shiny silver, glad I noticed when I did or it might have been a sticky end for my fish
try taking the photo in the evening with curtains closed, all lights off, tank light on and no flash. We can tell it's nice and green though anyway :thup:
I have one of those cardboard concertina files for bills and receipts etc, this one is the only one that faded haha.
Next one I get I will take a copy of it too just in case.