I think the general impression is that tomato clowns are in the middle in temperament. More aggressive than you perculas and less than your maroon clowns. I have kept a pair for 7 months in my 34 gallon aquarium and they have been model citizens. The only aggression I have seen is when the female chases the male away from food. I read about clown fishes feeding their anemones and have witnessed this with my female maroon (don't worry, different tank). I have yet to see this with my tomato clowns. They eat everything in site and would take the food away from my anemone if I let them. Of course, they think it's their anemone, lol.