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Hat is this red coral? It showed up out of nowhere

What type of fish (Blenny) is this?

As of today I have a 30 gal reef tank but I'm planning on getting a 125 gal tank as an upgrade. Could I put a sailfin, blue, and yellow tang in this tank? To be clear I would not get them until I upgraded. Thanks!

I just got this guy today and I don't know what he is or what he eats. If you can help me out thanks in advance

Lately my anemone has been doing something strange. It retracts all the way and spews weby white stuff around it on my live rocks. It's happened twice pretty recently. What's going on?

I have found these white swirl things all over my live rock. What is it and is it good or bad to have?

I'm possibly getting a 100 gallon tank and I was wondering if this list of fish will work for thereef tank: -blue hippo tang -yellow tang -2 ocellaris clownfish -royal gramma -copperband butterfly -Midas Benny -firefish -sailfin tang -flameback angel -Niger trigger

Recently I have discovered ICH on my flameback angel. I've gotten rid of the ICH before but it took a long time. Does anyone have any tips on exterminating these parasites faster. I use this reef safe ICH treatment and that helps a bit. My ammonia, nitrite, and nitrate levels are or very close...

Need help identifying mushroom coral. Is it healthy? If not what can I do to make it better?

I have no idea how to describe it so I took some pictures. I just found this thing moving around my rock and cleaning it (I think). I have a turban snail but this thing does not have a shell. HELP

I am planning on getting a flame angelfish and a valentini pufferfish in the same tank. Are they compatible and reef safe?

Recently I have noticed 3 different types of white things on the side of my tank. One looks sort of like a firework or spider shape and the other looks like a slug. The last one has a body, antennas, and a tail? I'm really confused on what they are, does anyone know? My camera couldn't really...

I have a firefish in a tank with no other fish so far. I'm fighting off ich in my tank and so far it's going good. Today I found a big mark on my firefish and I have no idea what it could be.

I just got some red mushroom corals but I just realized I don't know what they eat. Can somebody tell me more about this type of mushroom?

I know what you guys are going to say, I've heard about the tang police, but hear me out before you get mad at me. I've been looking into buying a yellow tang for my 30 gal reef tank. I've heard people say you need a 55 gallon or a 75 gallon. On the contrary I've also heard people say that...