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I found this on the bottom of my beautiful Duncan, and I'm not sure what it is, it has almost blue see-through tentacles with yellow bubble tips. It's very tiny so I hope you can see in the picture :-)

I found these things in my new 90 gallon tank in the refugium part of my sump. Can anyone pls help me identify if they are goo or bad?

We have had this saltwater tank for 5 months, every level is perfect, we use RO water, and all of a sudden we have all this red algae growing everywhere, is it good? Bad? What is it? :-(

Hi all, I'm looking to find out what is growing on my live rock, as I said before I'm a few months in and am beginning to find all these weird things in my tank, i take excellent care of my tank and just want to make sure this is something I don't need to worry about. thanks for any suggestions :-)

I just found three of these in my tank. Managed to get one out we obviously have not bought these we know it came from the Live rock. can anyone tell us if these are good or bad ??

Can anyone help? I'm a new saltwater tank hobbiest, and we have had our tank running for about 2.5 months. I noticed a week ago that there were these black ,swirly, coil things growing off of my life rock? they seem to have a white tips at the end of them.i spotted about 5 of them so far, they...