If added at the same time, and two small enough individuals you should be fine. There may be an initial fight over the most "desirable" cave, but a 90 gives plenty of room for each to have their own territory and cave.
Royal Gramma live in harem. I have 6 in my aquarium. They are very docile unless you got tow males in a tank. 2 males will kill each other in a 420 gal tank.
they are hermaphodies. One RG spend singificant time by iftself (as little as 1 week) will turn male quickly (IMO). That is the reason why people see that they kill each other, and why they have such a bad reputation. Have the LFS keep them together instead of separate on arrival, then you should have no problem buy a group of them. For 90 gal you can put 3-7 in it.
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