Bellus angelfish

Anyone ever have a bellus angelfish in a reef...looking to replace my watanabe that passed on, probably add in a month or so. Also tank is stocked with yellow tang, six line, Niger trigger, tomini tang and a clownfish. 120g...will adding fish since these fish have established themselves in tank be difficult...do I need to wait uNtil they all pass on?

 

Never had any myself but have always wanted to try two or three and see what happens. I do have a single Lamark that is doing remarkably well, nice and fat, had it for over a year, and no problem with corals or clams. But I understand bellus may be more sensitive/finicky, but then again, thats what I "heard" about Lamarks