1. Purple Tang- Adding two Tangs of the same genus (both Yellow and Purple are Zebrasoma) is a bit of a risky proposition. People have done it for sure, but I’m not the best person to ask. If you really want to have a second Zebrasoma go ahead once you’ve researched it well enough and the experts here say okay, but if I were you I’d get some kind of Foxface. One Spot, Foxface Lo, Magnificent, Bicolor, any of the smaller Rabbitfishes.
2. Black Tang- That’s a Third Zebrasoma, which complicates things even more. I would suggest a Bristletooth tang (genus Cthenochaetus), like a Yellow Eye Kole, Square Tail, White Tail, or Tomini.
3. 5 or 7 Chromis- People have kept them before without them killing each other off, so I suppose if you add 6 or more it could work. However, they’re prone to uronema and I’d still be worried that they’d kill each other off. Ask for more opinions.
4. Melanurus or a Leopard Wrasse- Good. You could do both. Just keep in mind Leopard Wrasses are a difficult fish whereas Halichoeres (which the Melanurus belongs to) are easy.
5. Pair of Mandarins- Just make sure they’re a mated male / female pair. I think you might even be able to mix species of Dragonets, I’ve seen it done before.
6. Cleaner Shrimp- Good.
Why not try some angelfish? All of the Centropyge would be suitable for your tank, you could probably even do one medium sized angel or maybe a pair of Genicanthus angels (Spotbreast, Bellus, Watanabei with Watanabei being the smallest). Genicanthus are the most reef safe genus by far.
If I were you I’d do:
x1 Yellow Tang (8”)
x2 Ocellaris Clownfish (aggregate 6”)
x1 Midas Blenny (6”)
x1 Four-Stripe Damsel (2.75”)
x1 Diamond Goby (6”)
x1 Yellow Eye Kole / Square Tail Bristletooth / White Tail Bristletooth / Tomini Tang (6-7”)
x1 Melanurus Wrasse (4.5”)
x1 Leopard Wrasse (5.5”)
x1 Marine Betta / One-Spot Foxface (8”)
x2 Watanabei / Spotbreast / Bellus Angelfish or x1 Lamarck’s Angelfish (9”) (aggregate 12-14” for 2 fish of the Watanabei / Spotbreast / Bellus)
x1 Green Mandarin Dragonet (3”)
x1 Ruby Red Dragonet (3”)
And then instead of Chromis I’d just do a trio of Pajama Cardinalfish, but if you really want Chromis then make sure they’re all healthy.
