How to Stock 20gal?

[WindowsTen]

Hi! I'm new to reefing and new to this forum so wasn't sure how to search specifically for what I am looking for, so I thought I would simply ask!

I have a AIO 20 gallon Waterbox cube. I think I want some kind of goby and shrimp pair, and a clownfish. Anything else I'm not sure! What other creatures are more beginner friendly that could fit in the tank? I plan to have very regular upkeep with the filters and water changes however I don't want to overload it, how much can I comfortably fit?

Should I do a pair of clownfish or is singular okay? I'm hoping to avoid overly aggressive and territorial fish (both with species and order of adding them to the system) but I do understand that its their nature and it's not really predictable.

I'm planning to put some corals in the tank but don't know very much about them and I'm still researching, will update once I have ideas!
I'm also very open to unique suggestions not including any of those fish since I'm so new.

Apologies if these are silly questions, considering I've read a bunch of resources, I'd rather be told something 1,000 times than be wrong.

 

[WindowsTen]

Don’t limit yourself to Ocellaris and Percula. I’m not a fan of any designer strain so there’s me. The Pink and Orange Skunks are relatively peaceful choices (so I heard) if you’re looking for something different. Shrimp and Goby pair, you either want Tiger Pistol or Randall’s Pistol. For the smaller Gobies, choose Randall’s. For something like a Yellow Watchman, either is fine. Just know that the Tigers get larger and some get annoyed by them digging and moving rocks more, as well as making a more audible snapping noise.

You can add a 4th and final fish, I’d be tempted to do something like a Royal Gramma or Yellow Assessor, both are available captive bred. Since this is a 20G and you already have a Clown pair, I’d get the Gramma which is a bit more assertive.

So that gives you:
(2) Clowns (personally partial to the Skunks)
(1) Royal Gramma
(1) Shrimp / Goby pair of your choice

I don’t know if this would be pushing it, but if you really wanted to maybe you could add another very small perching / rock dweller? Biota has the Starry Gobies, Yellow Clown / Green Clown Goby, Cleaner Goby (captive bred).

This is super helpful thank you! I looked at the Skunks and wow they're gorgeous, if it’s feasible for me to get a pair, I do like their look more than the wild type and designer ocellaris. I think that stocking is pretty much the plan right now (royal gramma possibly interchangeable with something similar but I do like the color variation it gives).

After looking into it last night I’m most certainly going to get captive bred fish. Theres a much larger aquarium shop about an hour away from me I’m gonna check out today since I would like to support a local business if possible. :D