harmful

I found these two worm looking parasites or bacteria? Was wondering if these are harmful to my tank or beneficial. I’ve never seen them before. Anyone know what they are. One was found in my carbon reactor, and the other was found in my main tank.

These white dots appeared on our 2 month reef tank. Please help identifying. Pods ? Ich? Snail eggs? We just cleaned the tank and would like to know if these are harmful. Thank you

Hello everyone, I have these very small white things on my glass that are moving around every few seconds. My clownfish seem to be eating some of them. I can't get any clear pictures but I do notice that they have really small antennas on their head.

Hello! I’ve noticed this brown fuzzy looking thing popping in and out of a hole in my hammer coral skeleton (bottom left)I made sure to dip the coral before adding it to my tank, but I guess whatever it is, wasn’t phased by the dip. Any ideas what this could be? Is it harmless, harmful? Hammer...

Over the past two days I’ve noticed a thin and spotty film on the surface of my RO water. Any idea what this is and will it hurt my livestock? I’ve been removing it just by putting a strip of filter pad while mixing water.