I am feeding them rather irregularly. I'd say on average they get a fly every day, but there can be a week where nothing buzzes around or crawls out of the attic so they just sit there and wait. In Winter, the usual (then frozen) flies are augmented with frozen mosquito larvae and the infrequent flake. Summer provides a bigger variety of "garden harvest".
They were the most intriguing fish I've ever seen in an aquarium. Watching them creep out from the top rear of your tank and knowing how lightning fast they devour their prey... the anticipation was intense.
I'm sorry for your loss. Those two lived a very long life in the most epic home tank environment imaginable.