they grow to be 6"
i have two and there peaceful
they never bother my mollies
or pleco but im not sure about the gourami they eat sinking pellets.
these are my fish im talking about im not sure that there all like that
I have one that Guppy Newbe gave me and he is fine with all my fish. She did say that he nipped at the long fins of her Sail Fin Pleco. None of my fish have long fins so I'm good. I don't know if that is true for all of them. He is cool to watch and a great addition.
Heard they're pretty agressive!
I saw one in my LFS and wanted it straight away (they're pretty...hah), went home, read up about them, decided against it..
You should just keep an eye on him, and if he/she gets agressive, i'd take him/her back :S x