Planning New Tank. Need Some Comatability & Crustacean Help

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zeig

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I used to have a brackish tank and next year ill have my own apartment so i plan a nice low[ish] maintenance freshwater setup up.

tank size: aprox 30 gal

substrate:sand and rocks

filtration: one power filter, maybe a sponge filter, and a the pneumatic filters that is a grate under the substrate (cant remember the name)

stock ideas:
Guppys ( two or more of either neon blue tux, red fire, lyretail)
hifin lyretail sowrdtail
ghost flass cat
silver hatchet
Rainbow crab-[i will talk about this more in a second]
Blue lobster crayfish (Cherax tenuimanus)- [i will talk more about this as well]

As to the Crustaceans: i would only pick one of the two mentioned above as i know they would fight each other in a tank of this size.Many people say rainbow crabs are terrestrial but they fair well on both land and in water if they have access to both ( see this video and many others http://wn.com/Rainbow_Crab. I have also seen many videos of rainbows with many small fish and they seemed indifferent to the fish. If i were to get a rainbow crab i would either increase my tanks height to allow rocks that come out of the water so it can surface as needed without escape, OR i would add an acrylic air chamber it could access that will have an air stone supplying air to it that will bubble out lightly for a nice air exchange (just like in this video! but mine will be larger obviously. http://www.youtube.com/watch?feature=player_embedded&v=jdUv2riTplg#!).

Questions:
1)How does this setup sound?
2)Has anyone ever had issues with these crustaceans attacking fish?
3)WHERE can i find a rainbow crab for sale? [i can't find them anywhere locally or online, i live in Ohio]
4)Add any comments you'd like. i'd really appreciate input on this! I've been through many forums with little to no help!
 
generally - fish and anything with decent sized pincers do not mix.
 
I'll tell you now that blue lobsters are utter beasts and will eat whatever they can catch. Mine currently can't catch danios but I wouldn't be betting any money on guppies or delicate things like glass cats lasting very long.
 

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