I have tons of pods
in my tank of all different sizes and shapes. There are isopods and amphipods and worms cruising the walls from top to bottom by the time I turn the lights on. Some of them might even be copepods. It is hard to tell without some strong magnification.
I had a mandarin years ago. The tank I had back then had almost as much rock as water. He was a very curious fish that inspected everything that came into the tank. It didn't take very long before he was tasting, and eating, the food that I was feeding the other fish.