When I added my fiji LR
awhile ago I never rinsed it. Many little thingies came off the rock, from the crevices, and are sitting in my sand. My aquacultured rock was rinsed but there is still some debris that came off.
This isnt uneaten food, just pieces of crap, that looks bad. I tried to get it with the net but that just made a sand storm. And I had some crabs eaten before, so there are bits of shell and things like that.