Would you consider doing upper jaws or is your heart set on ornates? I'm a big believer in getting the fish you want eventually instead of settling. Guessing ornates cause that's the thread title.
As long as you have an upgrade plan(
J
jaws7777
) said, you should be fine for a few months. Ornates grow rather quickly. Around an inch or so per month. Or if an updrade plan isn't feasible or isn't 100% right now, would suggest playing it safe with some smaller upper jaws( senegals, polli, palmas, etc.) who don't grow as big or as quickly. Then getting some ornates at a later date!