I recommend buying a whole set
But more seriously it depends the size and style of the aquarium and how wet you want your hands. All of the scissors can
be used but the better ones are probably either the wave or nude scissors, or maybe the spring scissors which are awesome. The long curved scissors are also great and may be what you want.
It is all what you're looking for.
Sorry if that didn't help much, but maybe if you give me more specifics I can try and recommend something.