Not in my expierance no. In fact they are great at raisning fry. That said...they breed most relkiably with dither fish in the tank and THEY take a big toll on the eggs/fry. What I do is to allow the pair to hatch the eggs and then transfur the spawn as soon as they are free swimming. The pair recondition and start over faster this way and I know the fry are safe in my fry tanks. I have a batch of 200 or so that I moved to the fry tank three days ago.