Two fish with parts of tail missing.

[Rodan]

My clownfish tail has a chunk missing out of it, and my goby has some of his tail gone. What I find odd is how some of the gobies pectoral fin is missing around 1/4 of it. I have a midas blenny who seems to be really aggressive can anyone one identify if the tail is a bite mark? I sadly can get a good picture of the goby since his fins are like pretty much see through, but I got a a video of the clown.

 

[blaxsun]

I can't view the video, but if said fish have chunks missing out of them - then yes, they're generally bites.