I had a house rabbit for 8 years - he was such a character!
As long as they're not locked up most of the day you can probably get away with a smaller cage than the usual rabbit hutch guidelines (as these assume the rabbit will be spending all, if not, a lot of time in it)
What size cage is best? Bigger is better! A cage should be at least 4 times the size of your bunny when he's entirely stretched out--more if he is confined for a large amount of the day. Cage sizes also should be decided in conjunction with the amount of exercise time and space the rabbit has. One guideline to go by is at least 8 square feet of cage time combined with at least at least 24 square feet of exercise space, for 1-2 rabbits, in which the rabbit(s) can run and play at least 5 hours per day. You can build or buy your rabbit a two-storey "condo" with the floors connected by a ramp--they love this!
Rabbits do love platforms (either to sit under and snooze or as a great vantage point) so try and get something for them in that department.
Right...my foray into tropical are on hold at the moment as the new 60L 'nano' has been turned into a quarantine tank for 2 baby goldfish
After the last disaster (protozin resistant ich) i'm determined to conduct a loooong quarantine and make sure i spot anything before they go in the big tank.
So: * Will 4 weeks be long enough? * What should I be looking out for? * one of them looks like they might have a bacterial infection (white and very stringy poop) - what's the best way of treating this?
They're so tiny I hope they grow in quarantine otherwise the 3 inch monsters in the big tank might be a bit of a shock for them!