Right on both accounts for the corals! Nice eye.
Aggression is a concern as well. After having the 20 gallon for a while, it's starting to look a bit small to me for 4 fish. Your 90g sounds fancy to me lol! A lot of the new snazzy stuff is mindboggling to me so I'm slowly building up it as needed. If all goes well in another year or two I want to upgrade my tank size to maybe a 40 and keep this current tank as a frag tank. Maybe. Then I could get a Chalk Bass...
I read a lot about Corallimorpharia and Xeniidae being able to be grown in a toiletSame with green star polyps. I think green star polyps are really pretty but dang it gets to plague proportions in some tanks.
The guy I get my fish from actually feeds Metronidazole-laced food. He quarantines fish and inverts and puts fish through treatments for common parasites and diseases before sale. I got my clowns from him about 7 months ago and they have been amazingly healthy and good eaters.
What's your favorite coral to keep?