peterned posted a photo:

Lionfish (Koraalduivel) at Dierenpark Emmen's aquarium, dramatically posing for a brief moment, as it (they) glided through the tank.

If anyone has tips on shooting pics in these conditions, I'd be happy to hear them :) Typically I shoot in AV, high ISO and low F, underexpose for the intended darkness, and try to get a right angle on the glass for the least amount of refraction.

The 70-300 is a terrible "dark cellar hand-held" shooter of cource, but it turned out very nice (imo) considering :)