Frog Spawn

Tadpoles growing bigger click on photo

Spawn in centre front - little tadpoles lying still

As you can see I have taken out frog spawn from the pond and have spawn and small tadpoles which have hatched out of the black eggs.  The challenge now is to see how big I can grow them before putting them back in the main pond.  I have done this several times before and the small tadpoles have disappeared.  So if I can get them larger this time they may stand a chance at survival.  If only I knew what is wrong. 

There are so many of them and more to come.  I might try and use different vessels so they don't become too overcrowded.