Hi! I have size chicks ranging from 1.5-2.5 weeks old. They're in a giant tupperware (70L?) in the bathtub, and it's been working great. However, the boldest among them is trying to fly the coop and has been seen perched on the edge of the tupperware. I thought of putting a screen over the top, but didn't have any screen handy. What I DID have is a second giant tupperware, so I turned it upside-down over the lower one and clamped it on. I drilled a bunch of 1" holes all over it (see photo). So now I'm wondering, do the chicks have enough ventilation like this? And what should I do with their heat lamp, since I don't want to cook them in a greenhouse? (I also ran a 1" PVC in there for a perch. Is that too big for them?) Thanks!