usually the mom will act scared when she is nearing delivery. She'll also look kinda' boxy. I don't like breeding traps. at all. They scare the poor fish half to death. You may want to use a net breeder (i've used the plastic box kind) But I like to let the mom give birth in my normal tank and slowly catch the baby fry. (they don't swim alot at first) However, if your tank is large, It's better to give her a smaller tank (I'm going to use my 5 gal
. to raise the fry) and then remove her after she's done (keep in mind that the mom will eat the babies, so keep close watch
) Have fun and good luck!!