Unwanted guest

[Ghost_Shrimp]

I have recently been adding plants to my Ghost Shrimp tank, I know Wal-mart is not a good go, but I bought some shrimp from there with a plant. As I thought, they loved it, got a amazon sword from a different walmart, in a clean tank, a moss ball from Petco, and a banana plant from Petsmart. I come from a small town, only had one fish store that lasted, a nice one two. Well either I have been out too long, or we did not get the newest equipment. I know snails are bad, but never saw a plant in a sealed plastic container till I went to petsmart and petco. Well I came across chain of fish stores where I am at now, was nice, got some stuff, as well as two new plants, two of the three I was informed a Ghost Shrimp tank would love. Combada(?) and hornwort(?). Well while opening the bag of one of them, and plucking the plant out I was shocked to see in the bag, with just enough water to keep a guppie alive, some sort of odd looking fish. The more I looked at it the more it seemed to have many legs, or fins. Very small, and very hard to keep from swimming around. I figured it was something not good, a little to late now that the plant was in the water...

So any ideas what this little guy was, and what it could mean for the tank should there be more of them? Thanks for any help.

[Brhino]

google "scuds" - the aquatic critter, not the surface-to-surface missile. That's my first guess for a hitchhiker with legs.

[Ghost_Shrimp]

It could have been, it was very small so hard to tell from most pictures, only one seems to look somewhat like it. It was whitish-yellow, with a small area of black. Sorry I forgot to mention that before. The way the thing was acting, its "limbs" were on the lower side, though still not quite as low as the legs on this shrimp. If it was this shrimp though I doubt much will happen if any got in, seem like the ghost shrimp will eat them.

Thanks for the reply.