Greetings everyone. I have just recently completed my 20 gallon cycle. I went through it properly with parameters increasing then dropping to zero and then doing a large water change at cycle's end. All parameters are now at zero. About 48 hrs. ago I added two small onto cats, then a day or two later, two red wag platies, two sunburst platies and three guppys. Question is this - the two Tequila Sunrise guppies died - once shortly after I freed him from being stuck to my AC intake filter tube and the other guppy I have no idea what happened two. But this could have been the one stuck to the filter since they were both identical. Help please. Thanks.