Question I already have copopods and bristleworms in my fish only tank. I now notice tentacles coming out of my live sand at night. I sour like to get some coral. Could you tell me what these things are and are they harmful
Dont worry about it, copepods are extremely reef fridnly, and unless you have the larger variety of bristleworms (i mean the 6-10 inche ones) then they are perfectly fine as well. the tentacles coming out of the rock are most likely a very small variety of brstle star. which is also just fine for a reef tank. i would not worry about it one bit.
i have about 15 years of experience in the reefing hobby but have been keeping aquariums for about 20, i am up to date on all the latest equipment such as led lighting, dosers, the new tanks available such as the red sea max and i can help you with many creatures that most other people have never even kept before such as sehorses, cephs, and sharks and rays.
15 years in the reefing hobby and it has come to my attention this site needs some more informed experts.
Education/Credentials masters degree in marine biology