Am I overstocked?

[bleevin]

Originally Posted by Myka

How long has the tank been setup? How long was it setup before you bought it? How big are the current fish (the tangs, and trigger)? What skimmer do you have?

The Sailfin Tang will outgrow your 120g, so I would think of rehoming him before adding any more fish. They grow fast too. Is your tank a 4' or 6' 120? If it is a 6' you could consider adding another smaller tang, maybe some reef-safe wrasses (some are big some are small). I wouldn't risk an Angel (coral pickers). If your tank is a 4', consider adding smaller fish (under 5").

The tank owner previous had the tank setup for about a year and I've been running it for about 3months. The current size of the tangs & trigger is about 4inches - 5inches. The tank came with a kz Revolution S skimmer. The tank is a 4 footer.

It sounds like I should consider moving the sail fin out, which could make room for more fish?

[naesco]

Originally Posted by bleevin

The tank owner previous had the tank setup for about a year and I've been running it for about 3months. The current size of the tangs & trigger is about 4inches - 5inches. The tank came with a kz Revolution S skimmer. The tank is a 4 footer.

It sounds like I should consider moving the sail fin out, which could make room for more fish?

Absolutely. A four footer is too small for any tang species with the exception of the kole tang.
The reason is tangs are swimmers and need the swimming space longer tanks provide.
Smaller tanks don't allow the the change to motor up and swim.

If you like tangs consider moving up to a 6 footer.

[Myka]

^ Agreed. I have a Kole tang in my 4' 90 gallon. I wouldn't want another tang in there, anf the Kole is still only 2" long.