Just trying out some of your tips, thanks guys. Although that said, only 2 made it past the cull tonight, most of them I missed the focus. And wouldn't you know it the one good tang shot was right when he swam in front of the dirtiest patch of glass.

But it's the only shot I've managed so far out of easily one hundred where you can see the little yellow pencil line markings.
Also the trigger seems oversaturated somehow, he's not quite THAT blue. I should mention he's only blue like this when he's anticipating food; otherwise he's green. I don't know if it's a mood thing changing the colour or just a trick of the way the light hits him (ie., maybe because he's out in front he looks blue but if further back in the tank the angle is different and thus green?).
