small mite/flea like creature bugging my zoas

[KurtS]

hi guys, another question from me where I don't seem to find the answer to.

 

Got these guys harassing a zoa colony of mine since 2 days causing the zoas to stay closed.

They are between .5 to 1mm in size (estimated), bodies seem too short and thick to be amphipods and I can't see legs on them either.
They are also out during the day while any remaining pods in my tank are in hiding since I added my goby.

 

 

Any ideas? For now I've been sucking them up with a turkey baster.

Dipping is a last resort as I'd have to take out the entire bottom rock to do so but I'm willing to risk that to save these guys.

 

edit:

wanted to add that nothing has been added to the tank in a little over a month and these guys have first been seen on this colony which has been in there for 4 months or so now, so not on a new addition.

The only thing that has changed is last week I started feeding my goby frozen mysis in addition to the frozen brine I was feeding before.