I recently did some research on Fuel. (I presently dose Seachem's Reef Plus, which I think is basically the same except it doesn't have carbohydrates, just amino's and vitamens.)
What I found out is that Fuel was geared towards tanks with very low nutrients (ulns). (Disclaimer; this opinion came from a reefer in Atlanta who was provided this information by a Seachem employee who was a guest speaker at their local club meeting.) In an ulns this stuff is supposed to work wonders. However, if you are not zero NO3 or PO4 (or close to zero) then it will "fuel' algae....big time! If you're not ulns or close to it you might want to consider Seachem's Reef Plus. I have see nice visible results using this.
Since I run an ulns, I'm going to give the Fuel a shot once I run out of Reef Plus. If you try it, please let us know how it works for you.