Weird Parasite looking creature in my refugium

[tnm_ka]

So usually I never really pay close attention to anything in my refugium, all i do is get rid of some seagrape and Chaeto that have grown to an extent where it blocks off the top view of the refugium. This time after resetting up my dosing pump, i realized this weird creature hanging on the side of the wall and not moving. Anyone know what exactly this is and whether or not it should be kept? Thanks

 

[goody]

Could it be an isopod with coralline growing on it?

 

[ISpeakForTheSeas]

That's a chiton - most are harmless/beneficial algae-eaters.

 

[saltnewbie101]

So usually I never really pay close attention to anything in my refugium, all i do is get rid of some seagrape and Chaeto that have grown to an extent where it blocks off the top view of the refugium. This time after resetting up my dosing pump, i realized this weird creature hanging on the side of the wall and not moving. Anyone know what exactly this is and whether or not it should be kept? Thanks

Looks like the this I found in my Nano this morning

 

[Cell]

Answered your other thread. The new pics are stomatella

 

[Borat]

Chitons are very rare and you should count yourslf lucky to have this type of hitchhiker.