Adding Sharks?

Right now I have 5 coral catsharks eggs in a 50 gallon tank hooked up to my 90 reef. Here is a picture of my other coral catshark.

Do I have to worry about my current catshark eating the babies if they are to small?

I plan on keeping one of the sharks and giving the others away as soon as they are eating.

If I have to worry about the babies getting eaten will the 50 be large enought to grow a couple out before putting them into the 220? Or do I have to make plans for another growout tank?

What size should they be before I add them?

The potential baby killer. He doesn't bother the damsel or clown in his tank.

Thanks for the response. Will they be able go grow to the proper size in the 50 gallon. If not I am going to order a 100 gallon bin.

About 15in and very slender. There is a ruler under the container and shark in the picture. I will order the Rubbermaid, set it up and just wait it out. Thanks.