Thank you for adding my wife and I to the forum. I am a returning hobbyist after having been away from aquariums for almost 40 years. I recently bought my wife a betta and that started up the interest for me too! We just bought a 15 bow front tank and it has cycled with three Pearl Danios. Currently there is a female in hiding and two males that harass her. I want to keep only Danios and I am not sure if I should add more or what the maximum number should be. Also, would adding invertebrates be a good idea? It still a ‘new’ tank and I was wondering how much time I should give any additions if any?