I purchased one around 2" in October for my 75 gallon. He is now around 4" and lives with 5 mono's (seabea's and argentinus) a green and ruby scat, figure 8 puffer, 2 angels, pleco, columbian shark and BGK. He tends to chase the mono's out of his territory at the top of the tank, but thats due to the tank being a little over crowded right now, hopefully will be upgrading everyone but the bgk/pleco/angels into a 120 gallon in june or july to convert my salt level higher as it is pretty much close to pure fresh right now. The archer is doing fine though. He will take frozen blood worms or krill (hand fed, be careful there quick ones lol), also live guppies. Def. the king of my tank, hands down.