Noticed this in sand

[muhast]

Is this some type of work/organism? It is poop under the sand? Any ideas? It is only in one area(back corner of tank)

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[sn4k33y3z]

To me looks like a type of serpent star. You sand looks brand new, just finished cycling, and you used live rock instead of dry rock?

Can you zoom in and take picture of a single cluster?

 

[muhast]

Tank has been up since June.

75 gallon tank, about 60 lbs of dry rock and 25 of live rock

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[muhast]

It doesn't appear to move at all(but it could be nocturnal)

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[sn4k33y3z]

I'm fairly confident they're serpent stars. Does your entire sand beds outer visible edge look like this, or is it just in this particular area?

 

[muhast]

I only see it in one corner

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[sn4k33y3z]

OK- to me that further supports it's likely not a bacterial bloom of some sort. Can you slightly move that area of sand just a bit and see if they move? Or take a close-up picture?

 

[muhast]

Yes. I'll give that a try in a few minutes and let you know

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[sn4k33y3z]

That's what I do. Your tank is still very immature at this stage. It's likely this could be a type of bacteria blooming. If you move that area(don't go crazy stirring) and it disappears/mixes is with the water, I'd say it's bacterial. In that photo I do see traces of cyano algae beginning to bloom(the red/pink spots). Completely normal for the age of your tank. I'd bet the photo you posted is away from your power heads is likely a low flow area in your tank. Cyano typically will host in those areas. It's a good idea to read up on Cyano if you're not familiar with it.

 

[muhast]

It is actually directly underneath one power head and on the opposite side of the tank from the other. So it may very well be bacteria. It just seems to have a distinct shape like a worm

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[sn4k33y3z]

 

[sewer urchin]

Congratulations, you have discovered the wonderful world of benthic macro invertebrates. Looks like some of the many borrowing worms ( bristle are the most talked about ;-). Could also be some spaghetti in there as well. As they tunnel the allow water to more through the sand bed, reducing hypoxic areas. Mostly good guys

 

[raz0945]

Madusa worms family, spaghetti worms-part of the clean up crew.

 

[muhast]

I read that if they die they release toxins into the water?

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