Welcome to WC...nice to have you here

You ask a question that could have a few different out comes.
1. You big O eats them
2. He befriends one of the new O's and kills the other (3 O's are a bad mix)
3. Once your two smaller O's hit puberty they go after the older O and the aggression would cause havoc
4. It works and they all live happily
If you were to do this IMO would wait a while. Then when you are ready add them to the main tank you will want to remove the older O, rearrange the tank, put the two smaller ones in and after a bit add your big O. This does not always work but it could. Also have a plan B ready just in case it does not.
Please keep us posted as we are always interested what works for others.
