I've had huge problems with keeping res temp and water temp down. I have a working cloner but i don't know how to keep it cool since it's under the light all the time. is there a cooling element i could buy or do i just have to load frozen water bottles all day. which doesn't help. it melts to fast. like a 2liter bottle in 2 hrs maybe 4 if i'm luck and get a cooler day.
I'm assuming you do not have an airstone in your res.... Might want to try that, fixed some temp issues I was dealing with at one point.
To answer the original issue:
*note* I didn't read the entire post b/c it started getting off topic, so this might have already been said *note*
When I started trying to clone I spent about 2 months playing with the rockwool cubes and a tray/humidity dome. I could not for the life of me get anything to root. I knew what my issues where but I couldn't get over them. What my problems was, was patients and figuring out how often I needed to water them. So what I did which fixed everything, was to setup a diy bubble cloner. I didn't look at any of the diy setups on here or anywhere else, I just figued out what they need, which is mostier and air. So I took a clear rubber maid container, one that would be used for food, and cut holes in the lid so that I could put neoprem inserts into it. With a cloner like this I didn't see any reason to have the container dark, as you can easily clean it out if any signs of alge apear. I like the small container sizes as well, because you can deal with it alot earier and put it anywhere below a light. Also the neoprem inserts can always be switched out with pieces of tubing with a slit on the side so that it can be opened and the clone inserted, incase you can not get them. Anyways, I added bubble stones to the container so that bubbles come up under the clones. When the clones are put into this setup they should have just a tiny bit of the stem in the water. They could even be suspended above the water as long as the bubbles splash the stem. Thats it... You can add rooting hormone, which will speed up the process, but its not needed. Also, there is no need to have any kind of humidity dome or atleast I have never seen any need for this unless your RH in your area is below 40-50%.
And simple to just fix what you have setup right now, which is a clone in a cup of water is to add a airstone to it. You can root a clone by just putting it in standing water but you will get poor roots, small and not very useful, and it will take a very long time.
Some of you might disagree with what I have said but it doesn't matter to me. I've had 100% success rate from my setup and thats without having to do anything but cut a clone with a node on the end and stick em in the cloner.