Leather Corals are the best coral for beginners to start out with, the reason being is that they are very forgiving and heal up relatively quick. The two most common leathers to buy in a pet store are Toadstool and Finger Leathers. Each has a different way to cut it.
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Now if you have a Finger leather coral the only difference when fragging is you will cut one of the fingers off and attach it the same way.