Hydor pico evo-mag 180. It's tiny! I love it
Not an occ but a tank bred like the one I have now
I would think so. Auroras are perchers so I would say yes as long as you keep up on wc. I recently got a mocha clown and I love it.
Gobies live in burrows, they don't perch.
3 fish is to many especially when 2 are clowns. Occelaris is a species of clown not a way they're raised. I say no
id just stick with your current stock tbh