The SD's can be finicky with aquarium macros, but my best pictures with a smaller SD, were taken using the help of a magnifying loop. Clean glass, getting close as possible to the glass, a tripod and cutting the pumps helps a bit. You could tune the exposure setting down to compensate for lights.
I would just play with it, you really can't go wrong. For me, it always takes a bunch of picture taking to get one good one.