Have a baby regal that is smaller than a clown fish and a medium/large both in different tanks but on same system. Both of mine are yellow bellies from the Red Sea. The real issue with regal's is getting them to eat. They aren't so quick to eat and normally don't eat and die unless added to an established reef system. They love pods and sponges and will adventually eat mysiss, brine and even flakes and pellets. My advise is buy a 40 gallon tank from petco $1 per gal sale buy a new all in one hang on filter with built in UV and QT your new fish. Once he is eating and looking healthy for 3-6 weeks then add to display. If this is too much or space is an issue make sure fish is eating at lfs and then purchase him but take home next day so ur not shipping him on a full stomach even a short trip home fish throw up food and possibly making it that much harder for him to eat in new tank. If fish isn't eating and u want him go back daily and try to feed if he don't eat don't buy. Also if u haven't added any new fish lately check all perameters something maybe off that your fish have grew accustom to. Make sure u take time acclimating fish check stores salt level u maybe surprised how low it is, can have lfs oversize the water and bag u take him home in and drip into a 35 gallon brute taking your time to adjust to reef salt level before adding, this forces u to add fresh salt water doing a water change in same process. Turn lights off if u have fish that will pick on him for 24 hours put a towel over tank to block sunlight this may help acclimate him to the new home. Lastly regals should be in a REEF with lots of live rock and hidding spots. They are one of my favorite fish.