Can anyone tell me why my feather duster she'll has done this?

[tlowery070]

Is it from the mushroom?

 

[tlowery070]

Shell***

 

[hotelbravo]

I dont understand what your asking. Does what? It looks like a normal feather duster shell

 

[Four drachma]

If you're referring to the tear in the side, I'd suspect a fish do you have a tang.?

 

[tlowery070]

No. A fire fish and 2 clowns

 

[timnem70]

They tear now and then. No biggie.

 

[gogo7]

it might be looking for a better flow and food. they nip their tubes down to catch the flow of food better. have you changed the flow patterns recently?
the feathers on the one beside look thin. maybe a regular 'basting' will kick up some detritus for it to feed on. are you target feeding?