I keep 5-6 maxi-minis in with my blue Haddoni. They all co-exist just fine (touching even). I also have maxi-mini's in several other tanks with BTA's, and a Gig (different tanks). So far, no problems.
I also have a rock anemone on the opposite side of a 75 gallon from a huge RBTA. No problems there, and they've been together for about 3 months.