i own a valentini puffer, hes not as aggressive as i expected, which is a good thing since hes with two clowns and a trigger half his size, but i think that the valentini is a good choice , the only problem hes given me has been slight ich which lasted for almost a month, i used something called paraguard since i keep him with a gold coral banded shrimp(so far so good, he doesnt seem interested in eating him anytime soon), and hes doing better than ever in a 20, im planning to move him into a 90 or larger soon.