Ok Steve. I'm, ready with several fish for you to consider: Spotted and Kaudern's Cardinals.
1. Should I get one at a time or both at once?
2. Them being docile, will they stress out over living with 2 clowns? No as long as the clowns are not one of the hyper aggressive species
3. Am I reaching the bio-load limit with this size tank?
4. If #3 is a "NO", can I get 3 or 4 cardinals? -My kids want a school of fish over singles but I don't want the tank to be too crowded. . . that will work
Thank you for your consideration. Tom
Fish: 1 Ocellaris Clown, 1 B&W Clown, 1 Green Mandarin this fish is not sustainable long term in this sized tank , 1 Scarlet Skunk Cleaner Shrimp, 1 Fire Shrimp, 1 Corral Banded Shrimp can take fish, 1 Arrow Crab can take fish, 2 Peppermint Shrimp plus bunch of Bristle Worms and CUC.
Reef: 50 lb. Sand, 70 lb. Rock, Frog Spawn, Button Polyps, Mushrooms, Kenya Trees, Feather Star, and recently, several aiptasias. . . :-(.
Tank: 50g hex, overflow, 20um filter, 23 gal sump, 2 pumps, 3 in-tank circulators, 5 UH fluorescent, chiller 650, heater 150W, skimmer 65, I got it on 7/18/2014 but it is established for over 15 years!!
BTW, Getting the Green Mandarin and Feather Star was an ignorant rookie mistake on my part. . . .