08-12-2013, 08:27 PM
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Hi there. You may want to get that guppy out and into his own tank if you can, if he's still with us. Normally, when a fish is okay one day and then has a spine defect the next day, it's a good sign the fish has mycobacteria. This disease causes wasting away in fish, lethargy, sores, and spinal defects. The reason for the spine defects is mycobacteria causes these little growths inside called granuloma. The granuloma can attach to the stomach walls and to the spine itself and get so big that it literally causes the spine to collapse. :( Unfortunately, mycobacteria is highly contagious and also virtually non-curable so isolating any infected fish is the best course of action.
However, there is a second possibility and that is injury. Odessa barbs can sometimes be aggressive toward smaller fish, particularly when there are only a few barbs. It is possible that your barbs picked on the guppy and broke or injured his spine. If you can, you may want to get at least two more barbs.
Either way, your best course of action is to remove the affected guppy to his own tank.