A good practice when clipping leaf tips is:
-Cut all leaf blades down to one inch long
-Mist with Wilt-Pruf
-Allow to fully dry before placing under humidity dome that has been misted on the inside with plain water
-Keep temps under the dome steady at all times.
If this means running a light 24/0, that's fine, although some growers report that clones 'strike' faster if given some dark each day. I am satisfied with my own results under 24/0 and it is the choice of the individual grower based on conditions.
This helps reduce risk of mold.