Don't forget that the amount of waste produced your fish and invertebrates is
not the only factor in determining how many fish one can have in the aquarium.
Other factors to consider are the eventual size of the fish, their behavior
(are they territorial?), and how active the fish are. I do know that damsels
(with the exception of chromis) are very territoral as are maroon clowns. They
may not be very large fish but take up alot of room because they are so
territorial (aggressive). The puffer and trigger will get pretty large and the
yellow tang is very active. I don't think a blue tang would be advisable until
you get a bigger tank ( at least 85 to 90 gallons).

reefman