mini greenhouse?

[garcrob]

I have 6 cuttings and 2 poppy plants on a foam raft that sits about 3 inches off the water, once i put the slotted cups with the cuttings and plants into the foam they sit about 1/4 of an inch off the water,

everything works great on the system, i have plenty of air being pumped through the water,

what if i put little plastic domes over each plant to keep the air very humid around each plant? my thought is it will act as a mini greenhouse, or fry the plants either one. what are your thoughts, if any one is even on this site to respond

i have the domes on there already but just did it today so i am waiting to see how it works out, they are sitting under a 400w mh