Thanks- yes, I might have a problem with these in a couple of years! I looked them up on Fishbase and several other websites and they quote 8" as maximum size, but I've since seen more than double that...
The camera has lots of settings (most of which I haven't played with yet), including 3 main different focusing options- 2 autofocus (spot focus or a weighted average) plus manual. Some fish are slow enough to actually focus on the fish, with others I prefocus on the gravel, rocks, plants etc. Using autofocus (not just with this camera but with my old Nikon as well) works for some fish, but not for others with a complicated pattern as this seems to confuse the laser.
Thanks. I've actually got 9 tanks set up (4 in my living room and 5 upstairs in the computer room, but several of these are more for raising fry than anything else). The top pictures are of fish in my 4' tank (48X18X12)- the Satanoperca were intended to be grown on to go in the 5' tank, but they're far more placid than I expected and I'm worried about introducing with the much more boisterous geos.
The bottom pictures are the 5' tank (150X75X60) downstairs. As previously noted, the lemon barbs might challenge the available space somewhat.
Hi Caitylee- how brightly lit is the tank? If it's light enough you can switch the flash off and see if the pictures are bright enough without it. Otherwise changing the angle of the camera to the fish might help- I've found shooting slightly down works best for my neon tetras, which have a similar problem of looking washed out in pictures if I shoot pictures from level with them. Try shooting from slightly above the fish, and to the side of the fish, and see if that helps. If your camera will do it, playing with shutter speeds and apertures might also help- try a faster shutter speed or smaller aperture (bigger F number) so there's a bit less light. What you'll end up with is a compromise between a washed out blue and underexposed rest of the shot so you'll have to experiment.