Its larger, river rock substrate. Pebble size I guess. The thank is stocked to the max as it is. Its a 125g with a red tiger motag, black belt, convict, 2 jd's, and a sal. Plus lil coreys on the bottom. They all get a long so it hasn't been problematic. I think I'm gonna send back one of the JD's, they're not too exciting.
Scato, as long as I vacuum on a weekly basis, the dead black worms won't cause ill effects and the live ones are actually helpful?