You need to "lear" more about the english language. I said size issues. That trigger will get a foot long, the tang will get near that size too and needs a 6 foot tank, and its only a matter of time before the clowns start back in if they dont die from ich first from the stressed out tang. All I said is you will need to upgrade the size of your tank down the road. Oh, but now that you mention the aggressive part of it. All fish can be very aggressive especially any kind of trigger. Ask kelsey what her niger triggers favorite snack was...