Ok so I have various topics across the forums asking about what new additions

I should get for my 55g tank. (with 3 goldfish) Since I read that Bristlenoses and Hillstream Loaches are more of the side cleaning fish I thought maybe one of those. (I'd love to get one of each but I don't know if I have enough room for both)
But I also have a scum and algae prob on the bottom of my tank. The bottom is all pebbles and rocks, with several plants and I was wondering if there is a type of shrimp out there that could fit the job description.
I'm heading to the LFS tommorrow so I'm ready for an answer! LOL