I have a culture of both types of flies and it always seems like the hydei are struggling to produce and last. I know they are slower to reproduce and grow but this is different. They always have fewer flies and never really seem to boom. I keep both in deli cups with Repashy Superfly and excelsior. The melanogaster always boom and a culture can last 3-4 weeks while the hydei are lucky to last 3. Any tips or ideas on how to get the hydei to last a bit longer and produce better?