not an expert but try to help..
there are several things you can do with your camera..
1) Increase ISO to around 200 to 400 (SLR)
2) Shutter speed i think min that we can go is around 1/160 for active fish..
3) aperture depends on what kind of dept you want? smaller number denotes more light which aid in photo taking(can increase shutter speed)
4) if got marco mode/lens, using them will aid also as they have min focus distance and they are tends to be brighter..
that's all that i know.. newbie also.. hope it helps..
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