What is this?

[iamdon]

I just saw this today under my hammer and live rock. Does anyone know what it is?

 

[John Bolden]

I just saw this today under my hammer and live rock. Does anyone know what it is?

Its a sponge I also have one on my hammer. Its harmless and nothing to worry about.

 

[Ron Reefman]

Looks like a sponge to me.

 

[iamdon]

Looks like a sponge to me.

Does that mean I might be able to get a nudibranch?

 

[ISpeakForTheSeas]

Does that mean I might be able to get a nudibranch?

No - nudibranchs only eat very, very specific sponges, and which specific sponges those are vary from one nudibranch species to another. So, you would have to happen to have the right kind of sponge and the right kind of nudibranch, and you would need to have a ton of those sponges to keep the nudibranch fed long term.

Berghia nudibranchs are the only nudibranchs typically kept in our aquariums because they eat "Aiptasia" ("pest anemones") which are generally plentifully abundant in our aquariums, so they're the only ones we can typically keep properly fed for a decent length of time.

 

[iamdon]

No - nudibranchs only eat very, very specific sponges, and which specific sponges those are vary from one nudibranch species to another. So, you would have to happen to have the right kind of sponge and the right kind of nudibranch, and you would need to have a ton of those sponges to keep the nudibranch fed long term.

Berghia nudibranchs are the only nudibranchs typically kept in our aquariums because they eat "Aiptasia" ("pest anemones") which are generally plentifully abundant in our aquariums, so they're the only ones we can typically keep properly fed for a decent length of time.

dang guess I'll have one in the next life

 

[John Bolden]

Also if it goes into a power head it will get shredded and spew coral killing poison all over your tank.

 

[iamdon]

Also if it goes into a power head it will get shredded and spew coral killing poison all over your tank.

I thought only certain types of nudi has poison

 

[John Bolden]

I thought only certain types of nudi has poison

Well the aptasia eating one.

 

[ISpeakForTheSeas]

dang guess I'll have one in the next life

You could try some sacoglossan slugs (often misleadingly called lettuce nudibranchs); Elysia spp. can be purchased from a number of places online, and - while not as large or striking as many nudibranchs - you can keep them (and even breed many of them) long term in properly prepared aquaria. They do still have specific needs though.

I thought only certain types of nudi has poison

Many nudibranchs are poisonous, but what they're actually dangerous to and how dangerous their poison is varies greatly.