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[Edit: Shooting fish in an indoor aquarium setting is challenging, largely because the light is less than ideal. A fast lens is pretty much a requirement (i.e. f/2.8 at the minimum, though f/2, f/1.8, or f/1.4 are preferred). The other thing I have learned over time is to shoot with a fast shutter speed if you want to avoid motion blur from the fish swimming by. I usually shoot in aperture priority, but for indoor aquarium pics I now switch over to shutter priority and set a fast shutter speed (in this case 1/1000th sec). This caused the ISO to go up to 3200 which introduced some noise, but it isn't excessive. I would encourage people to consider shutter priority mode in this shooting scenario. Not sure 1/1000th sec is optimal--might be able to avoid blur from subject motion at a slightly slower shutter speed. Also might need a faster shutter speed, depending on the subject. Let the ISO go where it will and hope you have a sensor that can deal with the noise from higher ISO values in an acceptable way. For me, better to have a "sharp" subject with noise compared to a blurred subject with less noise.]