The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
It's a 56 gallon tank with a deep sand bed and almost half the tank area is full of live rock. If I put the collection cup all the way up it takes about 9 days to get an inch of clear water in it.
You didn't mention what you have in the tank... how many and what type of fish??
If it takes that long to get an inch of water with it all the way up, then it sounds like it's working fine - it just doesn't have anything to skim. What pump are you running on the Remora?
Has it worked before if not then wait. If so, then get any Saltwater Additive like Seachem Prime which helps reduce Nitrite and Nitrate and it will help produce bubbles