What is this on my live rock

[Beau_123]

Can you please tell me what this is.

 

[rilesjr44]

What are we supposed to be looking at in the pic there are a couple things lol

 

[Beau_123]

you are suppose to look at the red thing but if you know if i have anything else that may be bad or good that i should know about please let me know. thank you.

 

[Rutrag]

Looks like maybe a nudibranch.

 

[Beau_123]

Is that good or bad.

 

[Rutrag]

If it is a nudibranch, it's probably bad IMO. There are lots of different species, and each species has a specific diet. That diet might be algae, starfish, anemones, or corals. Unfortunately, there's only a few that we can look at off the cuff and say "that one eats ______" It seems like all the ones that are hitchikers end up eating some kind of coral. (Look in my pictures for my 75 gallon build. I have pictures of a couple different ones I caught in that tank. Yours does not look like the ones I caught as far as species, but this would be just for comparison.)

However, before we jump to conclusions, does it crawl around? Can you get a closer picture with a higher resolution camera?

 

[Beau_123]

I will try to get a better picture but it stays in the same place and there are a few other small ones around it.

 

[Rutrag]

10-4. If it doesn't move, then it's probably not a nudibranch. I'll wait for a new pic before my next guess.

 

[Beau_123]

Is this picture better.

 

[AbsoluteFaye]

I think I have that too. It was small and over two months it grew a little. I looked up gargonian coral and I THINK that's what mine might be.

 

[Beau_123]

Is it bad or is it good.

 

[AbsoluteFaye]

It's a coral. But after looking at yours again it doesn't look exactly like mine. I dunno. Sorry. :/

 

[Beau_123]

So do you have any other idea what it would be.

 

[Armoredspider]

It could be a sponge

 

[pairenoid]

i have like red ones just like urs that look like tree branches on all my rocks

 

[Keithhjs]

Looks like a sponge to me too

 

[Beau_123]

Could you tell me what these are.

 

[Keithhjs]

Looks like a brittle starfish but hard to see.

 

[Beau_123]

Is that bad

 

[Keithhjs]

No, good filter feeder.