10-20-2012, 01:10 PM
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Welcome to Tropical Fish Keeping forum.
Before I comment specifically, I'll mention our fish profiles section under the second tab from the left in the blue bar across the top of the page. All the fish you mention are in the profiles; if the name is identical to that in the profile it will shade, as you see some did, and you can click that link to the profile. But these fish are all there.
There are several issues with the combination. I don 't like to repeat what is in the profiles (I wrote most of them), but briefly small fish are not advisable with Firemouth. Gourami and cichlids are a bad mix always. I can't comment on the crab, no experience there, so will leave it for others to say if this is a problem.
Further info is in the respective profiles. You will find there are some other issues with filtration, plants, etc. for some of these. But feel free to ask specific questions.