Couldn't find anything on it about micro settings I have been leaving the flash on and I usually take pics with light on and off, one of my my aquariums sit in front of a window wouldn't know if that would matter.
I found the best pics of my betta came in natural light with flash setting on auto (this way it only flashes sometimes). Macro setting usually has a symbol of a flower. Most modern digital cams have it. If you have a digital cam put the setting to auto flash, auto action (for the squirts that always move like my betta), and just play around. See what works., I have a Samsung E656 and it makes very wonderful detailed fish pics