anyone who starts small with marine ends up upgrading after atleast a year
Except those of us that start small and go smaller
You could also run two small tanks that are completely separate from each other, and switch balls of chaeto from each tank every two weeks or so, therefore giving the copods time to thrive free of predation.
Not sure how well that would work. A partition accross which pods could travel would almost certainly be better than swapping macro. I find that my pods tend to pretty much abandon ship and hide elsewhere as soon as the macro gets disturbed much, so I'm not sure how many you'd be able to carry over.