Are you raising the minnows yourself or buying them from an LFS? I ask because feeders are usually a good way to give your fish parasites.
They're also not very nutritious, unless ofcourse you are feeding them with high quality food and then feeding them to your fish.
I have not heard of feeding lizards before so I can't say on that.
"Dried foods are not usually accepted, although some specimens learn to take them. Although it’s a predator by nature, it is very easy to wean onto dead alternatives. Offer a varied diet composed of frozen foods such as prawn, bloodworm, mussel etc., along with the occasional live treat of earthworms or mealworms." Taken from HERE.
I personally feed mine frozen blood worms, earthworm sticks from kensfish, and frozen brine shrimp. He also likes to eat my plecos veggie sticks.
He'll get shrimp as well once he's a little bigger.
Do you have any pictures of yours? It's always nice to see them, they're too cute
Ctenopoma acutirostre are very easy to feed dried foods, my four year old group eat Tetra Prima; Doromin; Cichlid XL; New Era Tropical Pellet; New Era Plec Pellet; Hikari Cichlid Gold.
Feeder fish, besides the whole ethical debate (it is illegal to use them in the UK), are a major risk for hobby fish. It is not uncommon for them to be riddled with diseases, partly because of how they are raised.