My remora took a little over two weeks to produce anything and it's getting better all the time.
__________________ 180g- Mostly BIG fish and some coral. ~80g Nuvo- My coral tank with "happy fish"~ 90g- FOWLR Not the not happy type of fish~ 125g- Freshwater Malawi Cichlids ~10g- Nuvo- The refugees from the Ich of '18
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