I looked at my tank with a flashlight yesterday and after seeing normal large and smaller pods found tiny ones... More like bugs than normal pods, size 1/2 mm to 1 mm, look like mini-armadillos in shape and have 2 very small antennas in the front. Very small size but looked like that have a shell or a pretty hard-looking body. They were all over the corals too, especially zoa and montis. Lots on the sand and rocks. When bright light touches them - they can detach from glass and either swim away or get moved away by the water movement. Is that a common bug or something bad?