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Anyone have a clue what this is and should I get rid of it? I was gone on vacation for a week came home and noticed it.

I tried this exact light, it burned out within a month of installing. The guy did send me a new one that I haven't re-installed. As for corals, I didn't have anything but low light corals at the time. The problem is you have to pretty much seal the back of it from being able to get water on it...

Be careful with emeralds if you have corals, I had to get rid of mine, he ate an expensive GSP rock.

Finally caught him!

After looking at pics, I'm almost positive it is a gorilla crab, it has black tips on claws like they said it should. Is that bad? He's pretty big, quarter or better size with legs.

I'll try that crystal, he does look cool, just don't Know if he is aggressive, etc. I lost a royal gramma that used to hang out in that hole, never found him dead, wonder if he attacked and ate him in hole.

I didn't, I'll try that. I just set it close to the rock.

Pic of the intruder.

U guys were right, he's still there, got sort of a picture of him. I tried the mason jar with shrimp for two days, no luck. Any other suggestions? He's some sort of fiddler crab looking thing, he has one big and one small claw. He hides in the hole on my live rock.

Finally found it dead in my aquarium. Any idea what it is? Is it possible there are more? Are they bad?

Can anyone tell me what this hair looking stuff is growing out of and in my sand bed?

Is this funny looking algae in my sump good?

That's funny, I hope the polyps don't plop out. I ordered this one online at saltwaterfish.com

Thanks! :-). I like it a lot!!

Latest photo. Is the larger side dead or can it come back?

I moved to the bottom and one head is inflated this morning, other still looks same. My lighting is 1-50/50 24" coralife T8, 1- 24" 18W colornax T5, 1-6700K 24" 18W T5.

Latest pic, it is doing really well, not hard at all to keep.

My trumpet coral is looking sick, photo attached. It is not really growing, it was starting to split when I got it and has maintained the same look since. Recently it got really thin on top and looks like "bones" are sticking out the top. Is it too much light? I've got it near the top of my tank.

Tried to get a pic, he went back in the hole before I could. I only saw his legs sticking out of hole, it didn't have a pincher type claw that I saw, it had a pointed claw on its feet like an emerald crab. I may try and spook him out of the hole and fill it in, it is a hole my jawfish abandoned...

Today I spotted a multi-legged hairy intruder poking his claws out of a rock during feeding, I didn't get a look at the whole animal, but it had a pointed claw on its legs like my emerald crab. Anyone got a clue what it is?? Is it bad for reef tank?

I looked later that evening and he had gotten his claws apart, he seems to be eating fine now!

I think I just figured out what's wrong with my corals, I just caught my emerald crab tearing off GSP POLYPS. I caught him and put him in the sump for tonight, tomorrow he's off to the LFS.

I'll look into the alkalinity test, I'm using the API saltwater master test kit and a separate API Ca kit. Is there anything else I should be checking?

Nephthyigorgia sp, I think. I've only had it a few weeks, I've been target feeding it and my trumpet coral zooplankton a couple times a week. It is supposed to hang upside down in the shade.

I glued a frag on a piece of LR and one of my peppermint shrimp got into it before it dried and glued his claws together. Should I worry? Try to help him get them apart? Will it just wear off and be okay?