In spring there was a mass of frog spawn, then taddies in the pond. Then i noticed that all the taddies were slowly dissappearing and some strange looking larvae or creature??? appeared on the bottom of the pond. They are about half inch long and have these weird three antennae??? at the front end. They don't move very fast. Any one any idea what they are and did they eat my taddies? There are no frogs or any other sign of wild life in this pond at all this year apart from the usual snails.