ok guys i need my say here . when ur taking clones dip the rockwool in a weak fert solution and gentle squeese most of the water out . the rockwool doesn't need to be wet , just damp. too wet will cuz the bottom of the cutting to rot anyways as the clone has no roots to start with iits pointless to give loads of water that way as it has no means to absorb it. u want to mist ur plants only once a day to stop then drying out. do much moisture will cuz mold to start. as soon as u see the roots coming outta the blocks u want to stop misting and open the vents in ur dome for a day , then the next day u want to offset ur lid so it leaves the 4 corners of the dome open , do this for another 24hrs ( this will stop them turning yellow after u transplant them into pots ).

by the way get rid of the heat mat , it inturn will cuz mold to form