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I get your Redtailed Black Shark is young, but I feel that a 20 gallon is just to small and might be why it became territorial. Eventually its going to need a 60 gallon or above. I'm not sure what rock melon is, but if its similar to cantaloupe or honeydew melon your RBS should be alright, just make sure that you only give it tiny amounts in the future.
I had a red tail shark in my 100-gallon tank years ago. They are carp and act like carp. They will grow to the size of the tank. They eat anything and everything and are just as dirty as their close cousins - Gold Fish. I had to eventually let my red tail loose in a local river where it was spotted off and on for over 5 years; almost a foot long and looking for a free meal.
 
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