Hi, I have not used guppies before but i have heard from buddys with Eastens feeder fish working well for them, But With westen not sure, I use canned cat food which i know might sound abit strange but with using a live or Ft toad i have the most success with it, With the cat food i have found Salmon flavour works best dip the mouse head in just a tad, Sorted, I use it normally when Toad scenting did not work, I got the tip years ago at a German reptile show in Franfurt, Its worked for many buddys that have had scenting issues