Added new rocks
Last night my daughter and I added in some rocks that she picked up from the Lower Illinois River over the weekend. We tried to thoroughly clean them before placing them into the water. A couple of hours later we noticed that a coulple of the rocks were "leaking" very tiny air bubbles out. Is this something to be concerned about or not? Is this just trapped air? One would leak for about 10 seconds and stop for a while. Then the other would leak for a few seconds and stop... What is going on?