Eunicid Worm remove or....

[Funky_Fish14]

If you are losing zoos, well, it could just be your water, but could be the worm too.

I kind of agree with Capping it... but man... I dont know how you'd know after how long? And what if you were to just leave the caps on? Waterflow /nutrient release from it would be darn slow... you might get some ammonia... but you also have a very large water volume you said...

Some eunicids are just detrivores too... I've 'kept' 2, one was a detrivore... 23" long unstretched, lived in a 75 for awhile and when I took the tank apart a year later i never found it and I never had any nutrient spikes? so im guessing it died and did not cause a problem.

Maybe try popping a zoo colony in an obvious place and see what happens to it? (watch it overnight a few times)

Cheers,

Chris