sunday 4th, ill add that its taking them a very long time to eat the lettuce i have feed them compared to normal, thier behaviour has certainly changed, they are not as active. illl also add that last year i had a few hundred of these tadpoles caught not from egg but as small tadpoles then placed into my aquarium, but after they started developing back legs and almost front legs every single one was dying so i released them and lost hope, i think it may have been a disease i also noticed that a few of them had difficulty swimming and would swim round in a circle very fast as if they had no ability to swim straight, i havent noticed this this year and i rinsed the eggs before putting them in the tank this year, and te old tank and equipment is gone, its all new gear, so we'll see in the next few weeks...