I agree. There isn't any tang that is not going to out grow the 29 gallon tank. You will need to have a plan in place when it out grows your tank. If it is set up as a reef, it will be very difficult getting it out later.

Also, be aware that the engineer goby is going to try and rearrange the tank to satisfy itself. And I have never seen a satisfied Engineer Goby. :roll So if you really like your tank to have the decorations a certain way, forget about it. Get that guy outta there now. There are a lot of smaller gobies and blennies that will fill its spot nicely.