It was very small, as big as or less than a mm thick only, maybe the body was 5mm long not counting the tail feathers.
Anyway the other thing I am wondering about, in the thread I started called 'Live food found out and about' you posted some photos that were ID'd as copepods. I have those and they have multiplied somewhat. In this thread http://www.thekrib.com/Food/daphnia.html they refer to these as cyclops and say they are a threat to daphnia, they eat the eggs faster than they can lay them.