I have a older ten gallon that was sitting stagnet for a couple of weeks because there was no fish in there. I drained it 2 days ago and put it under my twenty gallon which it will stay after I make the move to my new house. I was looking at the twenty gallon and it looks like the gravel from the ten gallon would look good in the twenty so can i just scoop it in there or do i need to clean it real good.
