you have not said enough information.
what kind of fish
how bigs the tank
other symptoms that might means she is ill
my male betta likes laying on the plants and my platies girls have there babies laying on this beautifull rock i put there,its very smooth and slanted.
unfortunatly almost all fish will be opertunistic and munch up the baby shrimp and any smaller weaker specimins.
i dont know if its something thats been done but i have an idea of coverting a tank to have a grid across somewhat like a giant guppy breeding tank so you could keep a male betta with...