Hey BuddroGreen, i have tried to bring the temp up and it was way to hot for me let alone the seedlings i left it for 2 hours and one of the big seedlings leaf was getting crispy, i am finding it so difficult to maintain that temp and RH i have no idea what to do i feel like i have already caused to much damage for these seeds.420Steve you're rock wool cubes are too wet for those little seedlings, even the bigger one. You just want the rockwool cube moist/damp not sitting in non-aerated water until they grow roots, you want the roots to search out for water. Once they have roots you can spray the roots and rock wool down every day with pH'd water, and leave some water in the clone dome bottom channels for the roots to lay in (lightly water every day) until you're ready to move into hydro set-up.
Also, you can get a seedling heating mat for underneath your clone dome to help bring temp up to 72-78f & 65%-80% RH (relative humidity) where propagation works best.
There are a lot of hydro guys who say it is easy as hell. I think it is... once you know what you are doing, but the ramp up is much steeper. You have to learn everything you need to grow in soil plus a bunch of stuff you need for hydro all at once. I think everyone should start in soil then transition to hydro. First off it is way cheaper to start because half the equipment is the same. You need vent fans and lights regardless. But if you start in soil you just get a fabric pot and some stuff for a soil blend. You can do your first couple of runs with a basic nutrient line or even just miracle grow like we did in the 80's, while learning about all the fun stuff like how to brew a good microbial tea. Once you know how the plant life cycle is and what nute burn looks like then you can start on Hydro. In soil it is hard to screw things up but you have added problems related to pests. In hyrdo you wont have near the pest problems but you can loose the whole batch in a day if something gets outta whack and you are not there. It is easy to underfeed in hydro and near impossible in a decent soil mix.
So there is a lot to learn and I think soil is the way to go in the beginning. Once you have that 80% down you can try learning the 20% extra that is hydro. All you really need to learn about hydro that isn't something you learn in soil is nutrient regimen. But everything else that you must learn can be done with less risk and easier in soil...except for pests.
One thing more to note.
Hydro is good when you have limited space. You can use a much smaller res then a soil pot for the same size plant. But most industrial huge for profit growers like the warehouse growers in Colorado are doing it in soil. If you are doing a perpetual grow there is no point in doing hydro. But if you are doing 1 run at a time like most of us home growers then Hydro is the way to go. The only real way to run perpetual is to have a bunch of independent bubble buckets, Hempy buckets, or soil. Since the nute profile changes weekly if you want to run a multi-plant hydro system they should be the same strain and age for best results. However if you want to run many strains you need to run them separately. And hauling a nicer hydro system than a bubble Bucket back and forth from a veg room to a bloom room is just the worst if even possible. So large scale perpetual grow ops do soil.