aquarist
Noun
Meaning
aquarist (plural aquarists)
A person who maintains an aquarium.
Examples
Batfish change greatly as they grow, however the potential aquarist is most likely to see them in their juvenile form, so that is the description of the colouration here.
The advantages of livebearing to the aquarist are that the newborn juvenile fish are larger than newly-hatched fry, have a lower chance of mortality and are easier to care for.