Eh, if it kills all it's tankmates as it grows it's probably a Jar, or a Lei they're both so tempermental. Lol! Seriously looks like a Jar and probably is as Lei's are a little less common because of there collection point. Sux too Lei's can be aggressive, but are usually more laid back than Jar's. The vast majority of Jar's go serial killer as they grow hope that's not the case for you though. Good Luck with him.
