Friend or Foe - Help please

[AdamR]

I am starting to get a bit concerned with the size of these guys, they have started to take swipes at the fish instead of running away. I thought they were shrimp but the growth in the last couple of weeks is incredible and they are starting to look more like crayfish.  Other shrimp are about a 1 cm long, these guys are about 3 cm and my be doing some pruning of my plants.  The tank has only been setup since just before the giant auction.

Are they shrimp?  Should I try to get them out?

Thanks,

AdamR

My tank is a 20g long, lots of live plants, 6 Red Minor Tetras, 2 Zebra Danios.

[touchofsky]

They look like crayfish with those pincers in the front.  Shrimp don't have those.

[AdamR]

Caught them, easier than I thought it would be, guess they think they own the place and didn't worry about a big net.

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