A few tadpoles that I recently got about two days ago are sort of inactive and I can't tell if they are eating much or not although I do see a lot of poop. I am feeding them algae tablets and boiled lettuce that I have frozen. They swim a couple of inches then just float to the bottom of the tank. I have the tank well filtered and use dechlorinated water. I don't know if they are scared and not moving but I would like some help with this.