As I've mentioned before, we are looking for a 90X45X45cm tank. In the meantime, in addition to our 60X36X30cm tank, we have 2 small tanks (30X30X25cm and 20X20X20cm). In our 30X30X25cm, we have 2 Mickey Mouse Platties. Eventually, my goal is to put the Platties into our largest community tank (when space permits). What would you recommend putting in the 2 small tanks long term? We were hoping to use the smallest one simply as a hospital / quarantine tank. But shouldn't we keep a fish or two in there to keep it cycled and ready should we need to quarantine a fish? It is very small, so if we keep a fish or some fish, what kind are best?