Clownfish tail

[NETSECPRO]

Hey peeps, I need a little help here. I woke up this morning and went and took a look at my tank like I usually do, and I saw something weird on my clownfish. I looks like his tail got bitten off, all she has is a nub there now. I only have one other clownfish in the tank along with a diamond goby. Any idea what could be going on? The tank has been up and running for about a year now, and everything has been fine up until this point.

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Thanks!

 

[kctango]

So you only have three fish in the tank??? What kind of CUC do your have, any sally lightfoots, brittle stars or the such?

 

[NETSECPRO]

Yep, only 3 fish. CUC is a few snails and a couple of hermit crabs. At first, I thought the affected fish was the male, so I figured the 2 clowns got in a fight and the little guy took a beating, but after looking closer, it was in fact the female that has the issue.

The fish are almost 2 years old, and have never had any problems. All my corals, which consist of a few zoa colonies, 7 head Aussie Duncan, and a few ricordia, are all doing fine, so I dont think it's a parameter issue.