Tank 155gallon w.built in overflow

[pszone]

I have a 155 gallon tank with overflow: it is not a reef tank but has some live rock
There are three small purple with yellow tail fish (that you start the tank with), dog face puffer, fox face, and sailfin tang
what to know what other fish are good to add to this and inverts to add...all recommendations are welcome.
the filter system is a bioball system with filter is there anything else to recommend as an add on or should the system be changed or is it good as is?
Can upload pics of anything if helpful.
Thank you

 

[geridoc]

Sounds like you started your tank with damsels - too bad, they will become aggressive, even to the point of biting your hand. I think that any of the more aggressive wrasses, such as the thalassoma family, would be a nice addition to your system. They are active, very colorful and full of personality, and will be able to stand up to the little bullies.