Looking for a diagnosis!

[daniella3d]

If you think it's an internal parasite, you can try Prazipro. It's reef safe and I have used it a few times in my nano with sponges, soft coral, SPS, LPS, feather duster, flame scallop etc...and none were affected. The only coral that was a bit bothered but survived was my pumping xenia. The fish pooped a very long worm.

It also take care of any flukes if there are some.

It does not kill the pods or bristle worms or bristle stars, nor the shrimp or snails.

If it is internal protozoar parasites, then Prazipro will not work and you then need metronidazole. I would not use metro in the reef tank though.