Good or bad?

So my grandma just got back from panama city and has brought me a bucket full of sand from under the water in the ocean
Full of critters. One that got me was about the size of a grain of rice and im not sure if they are bad. She also brought back a cool hermit for me as well.

 

About how large are we talking. Couple of millimeters?

 

ouffff hard to say from the pic, could be a parasitic isopod almost looks like a baby cuttlfish?

 

Baby cuddlefish would be really neat.

 

If it was parasitic how long before it would die out of a fallow tank?

 

It moves backwards. Really really fast lol. I really wanna say its a little shrimp looking thing i found a few dead ones in the sand with it but being from the ocean it could be anything. Oh well it may just go in and have to die if its parasitic. Going to be moving soom most likely so wont be adding any fish until after the move. So around august time.

 

does it look anything like this?

http://nathistoc.bio.uci.edu/crustacea/Isopoda/MLI 139b.jpg

 

I wouldn't ever take a bucket of sand from the ocean and put it in my tank, just sayin.

 

It does kinda look like that. But its hard to tell. I havent put it in the tank yet. And why not civic?

 

Because of the animal in question. We don't know what it is. Why would you chance putting an unknown object in your tank? Not no mention all the other negative things that could be in it as well.