A heat lamp? What about sunlight or fluorescent lamps suitable for plant growth?

Sorry didn't mention I also have plant lights on them 18 hours a day.

I'm not entirely certain, but I have a heated greenhouse that I propagate in. I have nighttime temps at 60F and vent when temps get to 72F. I also keep constant air circulation going, and the plants come out tough and hardy.

sounds like to me you are babying them to much! The harder you are on them the tougher they will be. I've actually germinated many veggies at 40F night temps. It took longer but they were beautiful.

you have got to keep constant air circulation on them and don't let that stagnant humid air stay on them,......nothing kills a plant faster than that. I actually vent my greenhouses multiple times a day, even on cloudy cold days, to keep the humidity down and replace the stagnant air.

hope that helps

you say you have lights over top of them? They look leggy, you might want to try lowering them. The 'grow' lights should be no more than 2-3 inches away from the seedlings. Some of them also look dry? And its best 16 hrs on 8 hrs off

But curious.. why are the sprouted seedlings under a heat lamp?

I would just do the seeds in a regular flat tray. Make sure you must them often to keep relative humidity up. Use a heat mat until germination; once they sprout you don't need the extra heat.

As long as your lights aren't more than 2 feet away they will get sufficient light. Do you have a window? Getting some natural light would be a bonus.

They could probably stay in a flat tray for 2 month until they were too root bound to survive any longer. We sell watermelons in flats that are in there for awhile and they are as healthy as anything

I'll send some pics of what growing in cooler temps with constant air circulation does for the plants.

I hung the heat lamp after I lost the first 16 plants. I read that they need alot of warmth so I figured the heat lamp was the way to do that. My grow bulbs are probably 16-18 inches away. I'm going to try turning the heat lamp off and doing 16 hours on the grow lights and see if that helps. Out of the entire pack of seeds I have 2 plants still alive but I don't have high hopes of them surviving. :(

They just go limp and then shrivel up.

The first 2 images show plants that were standing up this morning and are now laid over, tomorrow morning they will likely look like the 3rd photo. The 3rd plant looked fine yesterday morning.

Wow! I am definitely doing something wrong. I have a new pack of seeds on the way. I will be starting over as soon as they get here following all the instructions above.

The orange bottle or the blue bottle?