i have a crap load of Spionids polychaete all over in my tank and i am wondering if anythig eats them. Spionids polychaete are the tube like worms in all the nooks and crannys that make their tubes with the sand.
There probably is something that eats it, but I don't know what it is.
Like with most polychaetes, there numbers are probably gonna fluctuate greatly depending on availability of nutrients. So, less nutrients=less Spionids
How long have you had this problem?