the title says all. ihave a 55 with platies guppys and mollies. i have breeding structure in the tank (one male for every two -3 female, plants for the fry to hide) i was wondering what would be better, or if either is worth using seeing as it stresses the females out, also is it pausible to put a male and a female in either one of the breeder things and try to get the traits that the male and female have to come out in the fry? how would i know if she hasent stored sperm from another male that dosent have the trait i want?