Since you're doing only fish, dwarf angelfish are very colorfull and would work great. They aren't jumpers, and for the most part, aren't aggressive to other fish.
Smaller tangs would also be a very good choice for you. There are some from the Zebramosa family(not the sailfin tang), the Ctenochaetus family or the Acanthurus family.
Blue Throat triggerfish get a maximum of 9 inches in the wild. In your size of tank, they would be fine as they wouldn't likely reach that size. I would start with a smaller one as others have suggested. I did a lot of research before I added mine to an almost identical tank size and he has been very happy.
As for a lawnmower blenny, a year would probably be a sufficient amount of time for the system to develop to handle that fishes needs.
For your rock, the more live rock you add now, the quicker your system will be ready to handle the bioload. If you only add a little live rock, you're just going to have to be more patient and wait longer for your tank to develop.
|