You should be fine. I ran a 90gallon with 90# of fiji rock, 5 medium size fish and some corals with no problems. You may want to pick up a canister filter to run carbon and mechanical filtration every once in awhile. HTH
A hang on filter is good for multiple things. I have mine packed with foam and such to hold bacteria and it stop large chunks of waste from going into my tank. It also holds my carbon!