maybe they need their own tank, If you have the room to house the fry, I would go ahead and let her breed....try a bambo cave, they are said to leach potassium and this helps them breed..
hi mine get like that time two time male just not ready
one of my female longfins look like that for about 3-4 weeks until male decided he was ready maybe try moving his cave around i find this works well with a good water change:thumbup: