As mentioned, I'd be wary of the dog food ingredient in particular. I just feed my roaches scraps like leftover dragon salads and veges from the kitchen like carrots and squash along with occasional oats or bread slices. The colony has been thriving for a decade on that.
Exactly that. We have plenty of raw kitchen scraps (as we cook daily and are vegetarians
) and what my dragon won't finish also goes into the feeder bins.
For all pets I have and had, I want to restrain from "ready-made dry food" as far as possible.
For the fish I have to use it, but I'm not using it for the feeder insects (and I doubt I could even get it here), I'm not using it for my hissing cockroaches (which are pets, not feeders), I'm not using it for my dragon (I would only use such as "critical care" in an emergency), and I wasn't using it for my land hermit crabs (fed them with veggies, fruits, egg shells and fish; no pellets). All of them are (or in the case of the crabs, were) thriving.
I have seen that some people consider feeding veggies as "complicated" (saw this when I had to rehome my land hermit crabs - so many people wanted them to eat pellets), but as we always buy them for us, technically it's just scraps that would go into the waste bin otherwise. And for the dragon the veggies are a must nevertheless.
The bread slices:
We once did this. Once... It was a mess.
What happened: My husband put a piece of dry stale dark rye bred (German farmer's style bread, homemade, quite heavily salted) into a box of superworms. I was away. According to the usual schedule, I told him to clean out the superworms once every four days. That schedule has worked well so far. But the bread.... It was drawing a lot of moisture, likely because of the salt, and it was extremely nasty and some 20 superworms have died, some 10 in the week after. I wasn't there and my husband had to clean that up, he said he was almost vomiting (I believe him).
From then on, our rule is: no bread.
Other fail was flour. Also mistake by my husband. In German a "mealworm" is literally a "flour worm". So he put in some flour... actually what is left on the baking sheet when making bread. This however clogs the trachea of insects. Didn't look that nasty as with the bread, but a lot of mealworms died.