I think your tank is kinda stocked as it is. It may not look stocked now, but it will probably be a bit crammed when the fish start growing. Like right now in the 209 that is going on 3 months has a baby Niger Trigger, Imperator Angel, Clown Grouper, and will be getting a Clown Tang (oh, forgot about the Zebra!), it doesn't look stocked now but will be overcrowded when the fish are adults. Luckily I have some tanks to spare! I also wouldn't trust an eel with a Blenny, Goby, or Dragonette. One of my friends had a Snowflake and had a Steintz goby in with it. Needless to say no more Steintz.