Pica Tanks.. Help?

[Big MaC]

Hello Everyone, I am a complete newbie.. and I would like to start a very small pica tank, somewhere between 2.5 and 10 gallons, it would become a part of my Land Hermit Crab Tank, where the LHCS (land hermit crabs) could go and bathe/fish/walk around.
Now here comes the questions.
How small of a pica tank is possible for someone who is mildy experienced and wants it for the soul purpose of having a few tiny fish and a few small MHCS (marine hermit crabs) for the LHCS to cohabitate with.

Any thoughts comments and suggestions are greatly appreciated

(pic below is of my LHC tank without any of the plants that I have now added of them on the sides is a small 3 gallon fresh tank and a 3gallon salt tank. both are filtered, heated, and are tested for PH/amonia/nitrates regularly.)

 

[bribo12]

You can't fit any fish in a marine tank that is under 10 gallons IMO. Even a 10 should only have 1-2 tiny fish. A pico tank is extremely difficult due to salinity changes and a small volume of water that can become toxic quickly. The bigger the better so I would start with at least a 10 gallon.

 

[edwardclaxton]

I agree with everything bribe 12 is saying start with a 10 gallon and get to shrimp goby and a pistol shrimp they have a good and neat symbolic relationship. And are usually the choices for pico tanks. Your options are very limited at that size of a tank sadly.

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