Clownfish has torn fins?

[JohnnyMartinez]

Hey guys a few days ago I noticed both of my clowns have torn fins and it's pretty severe on my black clownfish. He also doesn't seem to be eating, but those 2 fish are the only ones who seem to have torn fins? Any idea how/ what it is? There doesn't not appear to be any fighting between the fishes, and I did recently have my emerald crab kill my diamond Goby. But this doesn't appear to be fin rot, it's a 75 gallon reef and all my parameters are great except for my nitrates at 20 ppm which I did a 20% water change this afternoon. Here is a picture which you can see the tears in the back fin, all of his fins are like that. Thanks!

 

[JohnnyMartinez]

Here are 2 more pictures also where you can see it on his side fins. When I feed the tank, he tries to eat, but just grabs some food in his mouth and spits it out

 

[JohnnyMartinez]

Anybody have any ideas?

 

[Newsmyrna80]

How long have you had them? Have you added anything new to the tank?

 

[snorvich]

How long have you had them? Have you added anything new to the tank?

This. When was the last time something wet was added to the tank? Of course a large emerald crab could do that as well.

 

[JohnnyMartinez]

Well a few weeks ago I bought a fox face, and I've had them since I first started my tank about 8 months ago

 

[snorvich]

Are both clownfish the same species? Same size?

 

[JohnnyMartinez]

Yep, the black one passed away, I'm currently treating the orange one

 

[wsoldier]

What ended up happening with the clown?