Pix & ID: Critters that come in your rocks: the good and the bad.

Hard to say from the quality of those pics, but I think they are sponges and shouldn't be a problem. We'll see what others think.
 
If they move then they are sphaeromatid isopods, harmless.
They definitely move. There's 100's that come out after the lights go out. My searches led me to the sphaeromatid as well. I just couldn't find any white with brown spots. They're primarily on my zoas. Just wanted to make sure. Thanks!
 
Three weeks ago when i went to the LFS to pick up live rocks, i had a clerk sort through them in one of the big tubs they were in, when suddenly a small moray eel came out from one -needless to say he got very startled :P
Hows that for a hitchhiker!
 
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Can anyone ID this crab?


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Yet another data point - If it's a hitchhiker crab, it's probably bad. (Except trapezia and tetralia)
This adorable little guy is a cymo crab, I believe. Gonna figure out how to get him out now.
 
What the heck is this?
Orange blob swimming in my aquarium, changes shape, about 3mm? long.
Moves by pushing water around its body like with cilia as opposed to wiggling - see video below.
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On drying dish.
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You can see water movement near its body by the moving particles
https://youtu.be/ihmCuE-ntxQ

Edit: I have sun coral- but no signs of it releasing larva - ever.
I also have sponges which apparently have a free swimming larva, but none near that color.
 
Found this guy in my sump (the red color is from my fuge light). About 1/4" across
 

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Can you help me identify these?

Can you help me identify these?

These guys were small for a long time but seem to have taken off as of recently. After battling aiptasia I am now learning the valuable lesson of identification. Can you help me identify these pink guys?
 
They look like Palys to me. I've had some that grow slowly, but most seem to grow pretty quickly. I'll allow them in my display refugium and in my 65g shallow reef local tanks, but not in the 125g main display tank. I consider them too invasive to try and keep under control in an sps dominate tank.
 
Very cool! Tunicates are very hard to keep in tank. I just picked up a decorator crab that has a white & orange hard tunicate on it's back. I wonder how long it will survive and what the crab will use if the tunicate dies and goes away?

 
Very cool! Tunicates are very hard to keep in tank. I just picked up a decorator crab that has a white & orange hard tunicate on it's back. I wonder how long it will survive and what the crab will use if the tunicate dies and goes away?

Mine are growing really fast considering everything I've always read and experienced showing how low their survivability is in the aquarium.

-Dennis
 
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Any one know if these are ok couldn't tell the difference between regular snails and whelk, the first one is my concern

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