Im fairly new to fish keeping & am looking for some advice. I started out 4 weeks ago with a 22 litre tank & it soon became clear that this was not big enough so I have now ordered a 50 litre tank, I have bought some media for the filter in my new tank & added it to the media in my original 22 litre tank to collect some of the bacteria, my question is - how do I now cycle my new tank as quickly as possible, ie how soon should I add my fish etc etc. I want the new tank running as soon as possible but don't want to harm my fish. I currently have only 4 guppies, running an external filter & new filter is a interpet pf1. Please let me know if I need to give any more info & please help me to transfer my fish safely. Thanks.