Diamond goby suddenly aggressive with clown fish?

[CarnageQp]

The tank is a 50 cube with lots of sand rock work. Prparameters aren't perfect but stable. Besides a bunch of LPS and a RBTA that's split twice, the goby and the the mocha storm Clowns are the only thing in the tank. They've been in there since May 2 with no issue. Now the goby is showing his mout off to both clown fish, but not biting. I've increased target feeding him but it hasn't helped.

 

[Brieninsac]

That's odd since Gobies tend to stay at the bottom and Clowns don't.

 

[ggfrancis]

Food!


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[Sk8r]

THat's typical goby 'keep off mah lawn!' but probably will never come to actual fin-ripping unless the clown pushes it, and clowns almost never do. With another goby it could be more serious, but this is bluster. The goby is merely showing where he thinks the border is.