03-29-2011, 12:00 PM
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Hi and welcome to Tropical Fish Keeping forum.
One of our resources here is the section called Tropical Fish Profiles, accessed via the second tab from the left in the blue bar across the top of the page. It contains most of the commonly-available fish, and many plants too. If the name as it appears in the profile is used in a post, it will be shaded, example: Tiger Barb. This works for common and scientific names.
I would review the profiles for the fish you are considering, as they are not whole-heartedly recommended for community tanks. The Red Tailed Shark gets big, much too big for a 56g tank, and it can be very nasty as noted in the profile. Tiger Barb need larger groups, at least 8, to hopefully avoid aggression, but they can be very nasty (fin nipping and more) with other fish, so tankmates must be carefully chosen. I would not myself limit your tank by having this species.
The rubber nose pleco is not (yet) in our profiles, but this is another fish to consider carefully. It attains 5 inches and usually considers smaller fish as food. A Bristlenose Pleco would be a better choice, or one of the smallish (under 4 inches) Hypancistrus species that are becoming more widely available today; there are a couple in our profiles, Hypancistrus zebra and Hypancistrus furunculus, and there are many others similar. Or the Whiptail Catfish is a good community fish and has some interest. Check its profile.
For some good fish, have a look through the tetra (under Characins in the profiles), rasbora and danio (under Cyprinids), most are peaceful but issues will be noted in the respective profile.
Hope this helps you.