Had a bad experience last night/this morning, and wanted to share, mainly so others can maybe learn from my mistakes.
Very, very early this morning one of the chicks started chirping, loudly. Since my bedroom shares a wall with the brooder room, it was easy to hear. I went in to check and see what was up, but didn't turn the overhead light on, only a little night light I have in there, so my visability of things wasn't that great. All the chicks were under MHP, but I couldn't really see under there, but noticed the cheeping chick sounded like it was on the left side. I carefully felt under, came to the conclusion that all of the chicks were on the right side, save the noise maker, and figured she was missing her buddies, so gently moved her over by them. Went back to bed, cheeping stopped, so thought everything was well and good.
Couple hours later my alarm went off, and I went back to check on the chicks. 8 of the 12 came out immediately to greet me when I turned the overhead light on. Other 4 didn't show themselves, so I peeked under to see what they were up to. Didn't see any of them. At which point I panicked, which may have made things worse, I don't know. I started to pick up MHP. There were 3 chicks in the back left corner; two seemed to have found there way to the outside, and were trapped between the wall of the brooder and MHP. The third had somehow become caught underneath the back support. I was using a piece of old fencing, much like the one Blooie uses, except I had it bent to create a flat top, instead of bending it into a cave configuration, because space limitations I found a little late in the game. I also noticed, that the spot the chick was caught under did not sit level in the brooder, but was raised a bit off the floor. I didn't notice this before, I'm thinking maybe because I set it up right away covered with the outer towel, so in the future I'll be doing a check on everything before I cover it up completely. The fourth chick somehow found a way to get under the dog pads I'm temporarily using for their bedding.
All chicks are alive, thankfully. The little one who was caught got scraped up a bit, and may have some trouble with one wing. But he is acting normal, and eating and drinking fine.
Made some emergency modifications to MHP, and am looking at doing more. Purchased a small shelf after work today. It's narrower, so has more room between MHP and the sides of the brooder, and has 4 thin little feet, so hopefully it'll be harder to get stuck under. Taller, too, which I don't like, but that can't be helped, and the chicks seem fine with it right now. I attached one of those cube grates things to it, because it was too narrow to hold the heating pad completely on it's own.
Anyway, I know we all love MHP; and I still do. I just want to share my experience so hopefully no one else has to make the same mistakes I did.