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@O'Shane
Nope. A chain tensioner will work, you need a tensioner not a derailleur. A derailleur is for a cassette, but it can be used on a SS sprocket if you play with the stop screws.
Your chain tension looks fine but if you change your chainring or sprocket you might want one of these or something like it.
http://www.chainreactioncycles.com/Models.aspx?ModelID=58437
http://www.chainreactioncycles.com/Models.aspx?ModelID=58437
http://www.chainreactioncycles.com/Models.aspx?ModelID=35108