Would make plans for both of them -- 2 will fight, and the other one is going to get entirely too big for your current tank.
Damsels have the rep for it because they're too often kept in tanks under 100g , but fish will reduce their own numbers to suit the space until they no longer feel crowded. They start with their own species and will move on to others if they still feel pressured.
Would a 75 sump/fuge help?
I plan to have more tang in this 90g as they get big I may set-up a bigger tank
troll?
I've got 4 tangs in my 175. They all love each other.
Scopas
Tomini
Regal
Unicorn
Along with other fish. I know they'll get bigger but idc. I like them.
But my '5-year' tank plan includes a 300g tank![]()