I've got a 10G with 5 small corys in there. Usually, they're pretty active, swimming everywhere and playing in the bubbles from the airstone. But sometimes, I'll catch one or two of them looking like they're dead, laying on their side on a leaf or almost belly up at the top of the tank. When I gently poke them to see if they're dead, they scurry away.
Why do they do this? Is this normal, or is it something I should worry about?
Why do they do this? Is this normal, or is it something I should worry about?