Nice one Kjell! Shake reduction @ work
With the flash off-camera with a pc-sync cord, at the side of the aquarium you could probably avoid the reflection.
I'll try that when I get my DS serviced. Have got two TTL flashes and all the cords and shoes needed, but the K20D is P-TTL only.:evil:A reason to never, never sell the DS. If Pentax doesn't decide to reintroduce the TTL... (hint, hint, Ned)