It has vestigial wings rendering it flightless. It takes approximately 2 weeks to complete its life cycle from an egg to a fly. On the other hand, D. hydei is a bigger species, a little smaller than a termite. It is more difficult to breed this species, but if the conditions are correct, the yield is high. This species takes about a month to complete its life cycle, so it's important to plan ahead.
Molds appear as powdery specks or circles.
I have no problems feeding these flies to the frogs. I haven't experienced any ill-effects. Several treatments are available. But, the first thing that needs to be done is to move the uninfested cultures to a different part of the house. Mite powders are used to treat infestations outside the culture.