Ok, sorry it took so long to get back to you but I am having computer difficulties at home (hope nobody at work notices that I what I am doing). A joyce is supposed to be able to support over 1000lbs per square foot. Now that is before you start adding everything (like concreate floor) onto it. Also, my friend was told that the length of the joyce and support will also determine how much weight you can have over the entire length of the joyce. Anyway, with the description of the dimensions of your tank, and the fact that it is against a load bearing wall you should be fine.
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