Hello and welcome!!!! You are going to get a lot of ideas on this one so here's mine
Stocking is always fun and can be a bit tricky. All fish have a pecking order if you will. So some fish people like to add first or last or in pairs or groups or alone lol
It really comes down to have you researched the fish that catch your eye and see what they need and how aggressive they are.
Clowns for instance are really fun fish for some and others hate the fish and won't ever put them in a tank again. They are part of the damsel species so that goes for any damsel as well. Some are more aggresive than others so adding them to an established tank with fish in it already sometimes will lower their aggression because they aren't already defending territory. And most nems aren't a natural host for clowns. The bubble tip which is the most popular is actually not their preferred or vise verca I'm not sure who really picks haha. I got 2 clowns with a RBTA and the clowns had nothing to do with it and now my domino damsels host the RBTA hahahaha but it's just as fun to watch and come to find out the domino actually prefers the BTA. So life figured itself out kinda lol
This goes for all species. Tangs for instance have a reputation for being aggressive towards the same looking tang. So if you already have a yellow tang in your tank and 6 months later you add another, the chances are the established tang will Bully the new tang to death(not in all cases) But if you put a kole tang in after the yellow it seems the yellow doesnt mind it as much. However if you have a big enough tank and you add 3 yellow juvenile tangs at the same time they most likely will grow together and find their own spots and their is less likely room for aggressive behavior.(not in all cases)
This is all just an example and does not happen like that in every case.
People have successfully added different fish at different times. The important part is you research the fish and give them the best chance to thrive not just survive.
The foxface you ask about is a great little fish! Some think a 75 is too small for them. As do some think a yellow tang is also too small for your tank. Just make sure you do the research and if you do get a fish that MIGHT or MIGHT NOT fit in your tank, do what you can with your aqua scape to make it as comfortable as possible.
75 is that middle tank where a lot of fish will fit but a lot still just cant
Also setting up a quarantine tank is a really good idea! Just get a small 10/20g form petco on their dollar sale and a little HOB filter with a little heater. It's a pain to start because you can't just out your fish in your tank but if you start it now it will save you SOOOO much trouble down the road. There are many methods people use. Just try not to bring bad stuff into your tank like ich or velvet.
Good luck and post pics when you can!!
