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.
Hello again Sylvia - fresh from your reply to my other post ! - wow those Rainbows are very impressive fish - just one reservation, reading the habitat they are from would they be content in the bare rocky environment I am creating - no bogwood ! ?
Wow guys ! - for some reason I haven't been getting notification of replies so only just returned to see all your replies - thanks so much.......loads to think about ! I hadn't thought of Rams - and never heard of Cockatoo cichlilds so off to check them out - SO EXCITED !!!!!