Dev: I think, as with any fish or critter - they all have their own personalitity. Maybe I just got a few good lobsters which didn't act aggressive at all. There's always a chance you can get a bad one. But they are reef safe, meaning they wont harm ur reef, as for ''fish-safe'' Its a hit or miss. In my tanks i've never had a problem. I've kept lobsters with all kinds of sizes and swimming levels.
crox- if u want to play safe, look at the Blue lobsters, its pretty sweet looking and very safe, it's said to be the safest of all the lobsters