05-12-2012, 09:19 AM
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As noted in the profile of the Tiger Barb and the Rainbow Shark [click on the shaded name to see the profile] both these fish should be OK in a 4-foot 55g tank with other medium, peaceful barbs, larger rasbora, and danio. If you go with the TB, increasing the group to say 11 might be better.
Substrate fish should be avoided with the shark, sometimes it will tolerate some loaches, other fish will not. Certainly it should never be comined with other so-called "shark" species.
Always check the profiles first, you will often find the answer to your questions.