Could someone please help me identify this little spore that has been showing up in my tank? The tank has been setup for about 6 weeks now. When I first put water in it I added a yellow-tail damsel and some live rock, about 2 days later the yellow tail damsel died and this weird looking thing was on top of him when I found him. Didn't see the thing again for quite some time but I've had several mysterious deaths in the tank including a replacement damsel, a pistol shrimp and goby which were added last week. The goby died last night. Please see pictures and help me identify this little terror. It looks like a spore of pollen under a microscope but it's blue and it can retract its little antennas when it wants to move (see picture with the damsel)
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