Doh, she was in the Molly tank waiting to go into labour tank and I didn't think she was quite ready. I'm always good with guppies and platys, they square off, but mollys are harder to tell. Anyway she was empty in the morning and 1 baby remained under the filter, rest were gobbled. rubbish. However last night I had 3 fish in hospital tank, 1guppy, 2 mollies, none looked very fat, but this morning, 20+ fry swimming with the adults. They were dark (mollies were black) and looked more like guppy fry but we will see!,,