I’ve had my tomato for 9 years now and it’s never been aggressive to its tank mates. Even during feeding. It’s had an RBTA the whole time I’ve had it and it never shows aggression when other fish swim close to the anemone (I’ll qualify that by saying there are no other clowns in the tank so it doesn’t have to share). Although, if I put my hand close to the anemone it’s in (the RBTA has split a few times) it will nip at me to chase me off. Also, if I place a coral or piece of rock close to its anemone, the fish will move it away unless I epoxy it down. The tomato frequently swims out and socializes with the other fish and it’s definitely one of my favorites.