Fish tank as an allegory to space on a RPG-focused MU.
If you want live plants in a tank, you can't just slap some in your aquarium. It will upset the ecosystem and lead to hard to control algae blooms that makes it hard to see the focus of your tank, which was your fish you had established already in that micro ecosystem. For plants, you make a tank as a water garden and, once established you add a few fish as highlights to the lovely landscape you created. Google planted tank, there is 'room' for more fish in most of those tanks by basic hobbyist standards.
I rarely play WoD, just cause that was a baseline assumption of anyone who might disagree with the necro post that arose this thread from its grave. I played SW1 and a few other heavy coded space SW places, I played BT (less the RP ones like 3060, more the strategy game that was 3065 with random battles starting up all the time).
If /you/ want space, stop asking others to tack on space to their games. /You/ make the great space strategy game, then have RP as a highlight, and you may get what you're looking. Go back to googling a planted tank, most of those aquariums go against the rules of thumb for how many fish one can put in a tank (less than the rule of thumb). The plants are the space game (awesome landscape=awesome space play) and the few fish are the sparkling RP highlights to an already amazing backdrop and people can focus on what they want.
Oh yeah, secondary to the allegory, or part of it. The tanks is a closed space, if space is too open and there is meant to be some major RP/meta going on, it will be hard for the fish (I mean players) to find each other.