What's your reason for using flashes for this shot? Is your tank lighting low?
What you're looking for? Aquascaping photography or fish photography? This will help you decide what function or technique to use.
BTW, since your camera is new, it might have some exposure metering error. Have you tried taking other subjects under bright daylight conditions?
Are all those photos underexposed to some degree? Usually I'll do a metering calibration if I suspect metering problem and it's new. However,
understanding how your metering works is extremely important to get the effect you want.
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