I've got a Yellow and Chevron together. I also have a Desjardini as well. Although, they are in a 180G. I had the yellow first for over 5 years in my 60G. Then when I upgraded to a 180G, decided to add a chevron and then desjardini last. It's probably the worst order to add them but it's been working fine for me over the last 2 years. Also, the yellow's the smallest, then chevron and desjardini.
In a 90G I think you may be okay if they're introduced together and you have lots of swimming room. The chevron grows quick, by the way, compared to my yellow.
HTHs,
Minh