Many of the marine fish we keep are very territorial and don't need more space or use more space than we can offer in a display. No animals in this particular display will ever need more space than what they have to live out a full, healthy life.
As for SW vs FW needing or having more space, I think that might be a bit of a stretch. It is very species related as to the amount of space an animal will need or use. Not what type of water they are found in.
As for SW vs FW needing or having more space, I think that might be a bit of a stretch. It is very species related as to the amount of space an animal will need or use. Not what type of water they are found in.