that video is awesome. love there feeding habits. i could sit for hours watching the white jump around there tank hunting crickets.
tbh one of the best food for any amphib or lizard etc is cockroaches. top tip, buy some large ones (name escapes me but may be hissing would work when its an adult) you buy them as food in some places. get a deep box with a fitting lid (must be a snug fit) put egg crates in there layed, a good thick layer of Vaseline around the top, a sponge damp not wet, chuck in anything fish food, dog food, veg scrapes etc and for get. feed water twice three times a week and with in a month you will have a feeding colony. my last lot i had in black bins in the shed i sold them as colony for about £200 per bin and i only started with 50 hahaha the wife wasnt happy about them being in the house but with a large monitor collections you need a good food sauce, they are a much more balanced food sauce and better for your animal, you can vit the food they eat so no extra vits needed. easier than cricket too.