What is the BEST roach alternative for B.Dubia roaches?

[SCF]

and what is an ideal feeder?

[JeffreH]

and what is an ideal feeder?

There is no such thing.

VARIETY is key to any diet. Feeding a single prey item to any species that is not in itself a specialist will have negative effects with time. Staple feeders like Silkworms, crickets, solider fly larvae, and cockroaches are considered staples because they can be fed safely every single day. With that being said, it is still important to supplement the diet with additional food items to create as much nutritional diversity as possible.

In the tropics, where many of of herps come from, there is an obscene diversity of insect fauna. Most species are opportunistic and prey upon a wide variety of arthopods and we should try to simulate this as best as possible.