Opcn
Big fish
You can add creyfish, Cherry shrimp, amano shrimp , red claw crabs. and any other inverts to help make it seem more Salt Water Like. Then I would add Gobies and some eel like fish.
/members.optushome.com.au/chelmon/Melanotaenia.htm
/members.optushome.com.au/chelmon/Glossolepis.htm