My tank had an abundance of Pods. Now I don't seem to have as many. My wife added a Striped/Green Mandarinfish to the tank. He managed to eat every(almost) single pod in the tank. He as since died. But the Pod population has not come back. There are a few in the sump and the drain but that's it! How do I get them back faster. My sand bad does not seem as healthy without them.