fire/spiders are not as numerous as bumblebees. Use a pastel male(higher quality the better of course) and you should get 25% bumblebees. The oranges brown out faster than yellows(according to popular opinion), so pick a good quality pastel male to get quality bumblebees. If you get a adult male pastel(not too expensive in today's market) you can pick one that hasn't got much browning.