Hi, everyone! Does anybody know when can I release my guppy fry in the main tank? They are 3 weeks old and I keep them in my main tank in a net cage. In my main tank there are guppies and a minnow same size as guppies. The rule of keeping them separate until they won't fit in the bigger fish mouth, doesn't help much, and I don't won't to keep them contained in such a small place if it's not necessary any more...