I just started a 10 gallon tank and this is my first time.. I cycled it properly. I now have 6 danios and 2 african dwarf frogs. I added 3 neon tetras yesterday and they all died overnight. I had my water tested yesterday as well and everything looked fine. My question is...was I overstocking my tank by putting the neon tetras in there? Is that why they died? or could there be another reason? I don't want to put anything else in my tank if I am overstocking it, so I really need to know the answer to this question. I don't want to kill anymore fish! It makes me too sad! Please help!!