...they also breed quite well in a canister filter sleeve! I hate to clean the canister for that very reason.
Also for that very reason, today when I clean the can. I will not be replacing the sleeve, but will be adding seagrass, another great breeding ground that I won't eventually have to throw away.
As to the stringy dusty stuff..I don't think it has anything to do with your pod population. But I would guess there is a healthy crowd of many different hitchhikers that could be creating it. There is an awesome thread, just search "hitchhikers" I think in this forum, and it may come up with something.
I get some spiderweb-looking stuff on my LR that I have seen others talk about. Unfortunately, I'm not worried enough about it to pay close attention. Have a look at that thread, though.