Generally speaking, dovii tend to be good parents, with the female protecting the fry and the male guarding the territory - it is often hard to remove the parents because they are defending the fry so diligently. How big is your tank? Often when the parents feel something isn't right they will eat the fry themselves - which makes sense in a fish world - if something is threatening to eat the fry, it might as well be the parents to have strength for the next spawn. Their eggs hatch within 3-4 days - I guess you could remove the parents just as they hatch, and then feed the babies when the yolk sacs are absorbed.