It has been many years since I kept linnies. I now acquired three babies (a few months old) all from the same nest. They are currently in a spacious cage indoors, but I hope to put them outside in an aviary once the weather gets warmer. I noticed that they poo regularly and frequently in their water dish. I seem to remember this happening before. Is it preferable to get one of these vertical tube water feeders that attaches to the cage bars? Is there a danger that, if kept together, they may eventually breed, assuming that they are not all the same sex? Perhaps in the longterm I should introduce other unrelated birds. What do people think?