For this sort of shot I would use the flash and a lens hood pressed against the glass, not a petal one but if you have one an old fashioned rubber one. This way the flash lights the tank but doesn't reflect off the glass. I would also shoot shutter priority (TV) set at around 1/125 and a lower ISO to around 400 so the fish will be sharper and with a flash WB it should look more natural.
For me though the dead give away for the aquarium shot are the two punters hiding behind the weed especially the one in the baseball cap!
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