ok i have had three mail guppis togther for awhile no female and they have been fine but i bought a male amazon swordtail who is happy and alive and a marigold i think (it orange) female swortail well she looked ok but the male guppies were all around her like movingin on her and stuff not raming or anything just being nosey. anyway a few minutes ago i walked in and looked and she was dead but the otehr fishi bought fromthere seemto be doing fine. i checked my water everythingis perfect. i was wondering if they were attacking her becuase she was female and even tho shes bigger she looks similar. i also have two red tailed sharks a dojo loach a pleco and two skirted tetras in ther in a 20 gal. but there is plent of places for them to hide and go. should i get a few female guppies or even one? i know that there should be 2 females to every one male but i dunno know what else to do unless the swortail was just sick to begin with. please help. 
