01-01-2011, 06:06 PM
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I'm afraid you will have serious issues with Tiger Barb (or most any other barb for that matter) in a 14g tank.
First, barbs in general: they are fairly active fish, so swimming space is essential or they become stressed. And they are shoaling fish, so they must be in a group. Six is usually considered minimum for each species, except Tigers [more on them in a moment]. They can also be somewhat aggressive, aside from the Cherry Barb which usually is not, so these issues are even more critical because fish that need space or need a group will often become very aggressive due to the stress at not having what they "need."
As most of them get a decent size (over 2 inches), a group of 6 would not be comfortable in a 14g tank. We have fish profiles here, second tab from the left in the blue bar at the top, or you can click on the fish name when it is shaded in posts and see that fish's profile. Info includes minimum tank size, numbers in the group, behaviours, and compatibility including what other fish will work with each species.
To the Tiger Barb specifically: this fish is notorious as being aggressive and a fin nipper, although these traits can often be minimized (to some extent) by being kept in a larger group, no less than 8, and in nothing under a 30g. Eight Tigers in a 30g on their own, or with a bottom fish, is max for this species. Check the profile for further info.
Unfortunately you are getting some very inaccurate advice from that fish store. All too common, sadly.