I agree with woofy if you remove the fry without sperating the parents they will have another batch within a month and you'll be back asking the same question. If you let the parents raise the fry you will be able to keep them for considerably longer. Just how long? Well that depends on the parents. If you sell them make sure the buyers are aware they are hybrids. You could (if you have the room) grow a couple out to satisfy your curiosity and use some as feeders. It's up to you, so as stated there are a few options available to you. The bottom line is, if this is somthing you really don't want to perpetuate the only long term answer is seperate the parents.
