Is it a 7 foot or 8 foot tank?
If you want to add the Yellow maybe put it in an acclimation box and see how the Sailfin treats it as they’re both Zebrasoma.
Definitely add the Anthias together, make sure there is only one male.
Definitely pair the Clown.
As for wrasses the vast majority of wrasses will be open to you for a 220g. I would suggest not adding the Rockmover / Dragon Wrasse or any of those in the same genus as they get large and are predatory and love to move rocks. Not really reef safe. Not sure about the Razorfish but I wouldn’t assume they’re reef safe either. Depending on how many wrasses you want to add..... you can do a couple of large ones like the Harlequin Tusk or a number of smaller ones.
You can keep more than few Halichoeres wrasses, Fairy Wrasses, Flasher Wrasses, Maori Wrasses etc. in a 220. If you want to go for an aggressive or semi-aggressive tank you can also consider Thalassoma Wrasses and the Lined Wrasses or Bodianus spp. AKA Hogfish.
If you’re up for a challenge and don’t want an overly aggressive tank you can add some Leopard Wrasses just make sure they’re feeding at the LFS. If not you may need to initiate a feeding response with live foods for a finicky one.
Genicanthus spp. angelfish, Yellow Pyramid / Zoster Butterflyfish look great in pairs, trios, for your tank if it’s 7’ or 8’ maybe even 4 but I’m not sure. For Genicanthus spp. if you want to keep more than one, stick to the Spotbreast, Watanabei’s, Bellus or Red Sea Lyretails. Maybe the Masked Swallowtail too. Lamarck’s are the largest out of these following species.
If you can find them, a pair of Schooling Bannerfish (Heniochus diphreutes) also make a great choice. I say a pair because they get larger than the Yellow Pyramid / Zoster Butterflyfish.
Rabbitfish, especially the Foxface species (Lo, One Spot, Majestic, Fiji Bicolor) and maybe a couple of the non-Foxface species would also be great additions. Since they have poisonous spines they may stand a better chance against your established Sailfin just in case it decides to get confrontational.
Blue Throat Triggerfish are the smallest and among the most peaceful and reef-safe triggerfish. The Crosshatch are beautiful but they get larger, are rarer (deepwater species), and much more expensive. Sargassum Triggerfish also get larger than the Blue Throat, I think. A pair of Blue Throats would do well in your 220, if you want to keep a single one that’s also fine.
As for smaller fish pretty much anything will work for a 220. Hawkfish (Flame and Long Nose the most peaceful), Shrimp Gobies (all gobies really), Blennies, lots of options here. I don’t know if adding any Firefish would be a good idea considering the presence of an established Sailfin Tang, they can be overly skittish. Basslets would be great. If you can culture a good population of pods, Mandarins and other Dragonet species will be an option.
Marine Bettas are really awesome. Best to find one that’s taking at least frozen foods at your LFS or even better an ORA Captive Bred one, once established they’re about the most bulletproof fish you can find.
Bristletooth Tangs would be yet another option. Yellow Eye Kole, Indian Ocean Bristletooth, Tomini, White Tail etc. all don’t get too large.
If you feel confident in your disease prevention skills, Acanthurus Tangs can work too. If assuming you have an 8’ tank, then maybe a Blue Hippo. If you want easy fish though, not sure if any Acanthurus or the Blue Hippo would be good choices for Tangs.
Hope this helps!
If you want something really unique, don’t want smaller bottom dwelling fish, are able to feed it and have really good filtration, maybe even a Snowflake Moray but Eels are really straining on your biological filtration so it basically comes down to 1 of two paths:
1. Have only a couple of larger fish with the rest being smaller to small-medium fish.
2. Have less fish overall and have a greater number of larger fish.