Being serious this time ....
It's the ecosystem (which is why I would never start a tank with dry rock) and the ways in which the various organisms interact. My younger son peers into the tank every night with a small flashlight looking for cool little critters. Priceless!
It's the ecosystem (which is why I would never start a tank with dry rock) and the ways in which the various organisms interact. My younger son peers into the tank every night with a small flashlight looking for cool little critters. Priceless!