I added two tangs to my 125, Powder Blue and Blue Hippo. I will add another powder blue and two yellow tangs in about two to three weeks. I’m planning on moving soon, so I will put them in the tank after all the moving is complete since the rocks will be moved around. I will add two false perculas and that will be the end of the fish addition frenzy.
The powder blue I currently have as the most active swimmer. The hippo will swim with the powder in some occasions (as best friends) but it will sleep hiding in the rocks most of the time. When feeding, the tank becomes active, my cleaner shrimp, arrow crab, helmet crabs, brittle star, serpent star, two Caribbean carpet anemones and my (Tank Cycling Machine) Domino Damsel.
When I add the two percs in the near future, I know they won’t need much space, and they will remain in one place. That place will for sure be where the anemones are.
When adding fish, I think of their behavior, temper, care level, etc. That way I know I won’t have problems in the end. I do a lot of research before buying and that helps a lot.
Good luck!