to show sex it depends on the strain/plant sativa takes a bit longer,yeah u can do a (pre-flower) to show sex ..then put it under the lights as if u were vegging..
i dunno about the strain i see some purple there but thats a good thing..it looks like it's favoring the indica side..as far as yield it really depends on how big it gets ..
rice works,but so does a cardboard box or brown paper grocery bag..or u can wrap in newspaper..if it gets too dry,put it in a jar with an orange peel..
get a 30x pocket scope and scope the tri's ..look for cloudy and some amber tri's ,this is the best time to harvest....the scope will set u back $10-15...well worth the price..
i had the same thing happen u can grow out the hermies all the seeds or most will be female or give them the chop..femished seeds can pass this trait down from the original plant to the clone from it..it's rare but it can happen.
when the clone starts to root and bring its own water up the stem that happens alot because your also misting it as well..so you wind up overwatering it a bit..