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I have a 20g and I would like to have some sort of Lobster or crayfish in it. Could I have some suggestions on what would do good in a 20?

No fish is compatable with a crayfish, and in that small of tank it will kill other crayfish.

OKay, you can't really do much with a cray in a 20 gal. Feeder goldies (comets) fare well with them once they get past about 6" or so, but keep in mind you'll need a HUGE tank. Also, I've heard of small feeder guppies being kept with crays. Expect a few of them to be eaten, and the rest will eventually learn to stay out of reach (of course you wont have as much of a problem if your tank has nothing for the cray to climb up onto). Not sure how snails fare, either. All this is quite troublesome, and if you want some sort of crustacean, I'd go with a shrimp + snail tank. Just as exciting, with fewer personality issues.\.

Its and empty 20g. I was wondering what crayfish would do well in a 20. Im not going to put fish in it.

you want a Red Claw Crayfish, do a serch for them and they are awesome

ive kept blue prawns with cichlids

rawn aint like Lobsters and Crayfish, I know they are both Inverterbrates before you say anything, but Lobsters and Crays are opportunist hunters and hunt live food whereas a Prawn cannot do that and eats algae or tiny bits of flake, not whole fish

Depends on the prawn I've had some pretty wikkid hunters.
Think LONG ARM PRAWN


OK, There are lots of cray you could have.
Look in the genus Cherax and Machrobrachium.

Most will enjoy a heater and most will try to renovate madly.

MAKE SURE YOU HAVE GOOD HEAVY LIDS!

For animals, the entire universe has been neatly divided into things to (a) mate with, (b) eat, (c) run away from, and (d) rocks. - Terry Pratchett