I am photographing a wedding next month and the reception is at an aquarium. The bride wants some 'fun' shots around the fish and shark tanks. I'm worried about the flash. I'll have a f/2.8 lens with me, but I'm sure I'll need my flash anyways. What would you recomend being the best way to avoid a bad reflection from the glass on the tanks? I've got a speedlight that swivels every which way to I can aim it wherever I need to.