I had 10 domineque chicks i bought at the sale barn 2 days ago. they are inside my house were it is 70 degrees i have them in a parrot cage till they get big enought to put outside in the coop.. thy just started to get some feathers.. they are huddeling up together alot so i put a heat lamp on them now they are laying down, and there body looks almost limp till one of them moves and then they wake up and move around a little then they lay down again, now that they have the heat lamp they are spreading out.. want to know about how old they are and when do i take the heat lamp away. or do i leave it on because of temp in my house.. here is a pic of them...
the heat lamp is mounted above the cage facing down, does not have a thermastat is this ok

the heat lamp is mounted above the cage facing down, does not have a thermastat is this ok