Image REaper used to call my propagation setup the 'Pot Roaster' when I had to run heating pads under it.
There's a cloning guide in my siggy. You need to sterilize your gear- spray it with scrubbing bubbles or lysol and rinse before use. Low light, stable temps right AT 75-80, stable humidity, clean environment, and if your gel is spoiled you're fooked. I stopped using Clonex bacause it goes bad real fast. Dip n grow has fungicide in it... fyi..