#critterid

Doesn’t look like flat worm, I have a couple of these in my pico tank… good or bad guys?

Hello! I recently bought a tank and found this free fuzzy thing on one of the rock. Anyone know what it might be?

Hello folks: I suspect I have diatoms so I took a sample of my sand and analyzed it under the microscope (the sample was taken using the "10/0.25 (160/0.17)" lense with the WF10X (DIN 18 MM) attachment). Sure enough, I do see diatoms but I also see some "worm looking" critters that I have...

I bought this coral from my lfs about 4 months ago and always noticed that it looked like something was under/inside of it. Recently it has moved out slightly. What ever it is seems "fleshy" so not part of the coral and when ever I do a water change it goes back into the hole for about a day. I...

LOL made me jump. The reef mat gave notice that the roll had ended. Went in to cut the filter and was rolling it up on the take up roll... What the heck are these?? And should I be worried?

This glitter bomb Goni was super happy for the first few months , then closed completely a few days ago and is slowly re-opening with bent , hook shape , polyps It is not fully opened (about 60-70%) I am just wondering if any of you guys have encountered this before and know what causes it ...

Hey Everyone! I came back from a vacation to notice what looks like a bunch of dragonflys swimming around in one of my tisbe cultures. They swim around in pairs like mandarins with little 'wings' on their backs. I'll try to get better pictures and videos when I'm home later. Any idea what...

Hey guys do you know what is it? It was crawling on my glass before lights went off.

These little white strands are coming out of rock work especially in the evening they are all over the place. Tried suck and grabbing with tweezers and they just retract. I was doing some research and they look like digitate hydroids and doesn't seem as if there is anyway to rid of them...