another great video tranc... you are doing a excelent job over there thus far... as far as you pruning your roots I dont thing you have to worry about that little bit I had to do tha same thing on a tub system that I used to have and they didnt die. and for them clones with no dome well just keep the fan off them so they dont dry out. mist them if you must for the first few days but little is best, just enough to keep them standing. if they dont droop then dont mist.. also I been cloning for years and I never make my cut under water. the key is right after you cut off the branch to stick in a cup of water and then slice your 45 on one at a time so they are not exposed to air for more than a couple seconds....
that 12/2 wire is all good btw...
keep it up...