Heavy blues, although mine definitely bounce more with the less light I give them. Another thing is I have come to believe is that the more it’s bouncing the healthier it is IMO. Absolutely no certainty with this, it’s just my observations so take it with a grain of salt. But if my shrooms are losing their bounce it’s definitely a bad sign. They are more healthy when bouncing like mad, and it looks like that’s the same for a lot of other peoples shrooms. Also, when fragging, if you cut a side with a large bounce I have always had it live or stay attached without my help, even if I didn’t get the mouth of the shroom. The sides that detach or take a long time to heal almost always don’t have bounces, even if they got full mouth.