Made a mistake! As ginger is showing signs of giving birth again I released the babies into the main tank, cleaned the breeder tank, gone back go the tank abd the babies keep being chased by the biggest BS Tetra. Have caught them and put them back in breeder along with mummy. She's not bothered by the babies at all, neither when they were in the main tank. I've tried to catch the baby BS but no chance! It stays in a bush and the very local area making it really difficult to get. Big tetra seems to be patrolling that area, could this be guarding her baby?