LW- I grew 1 seroius Cronic a couple years back. I ended up flowering it alone under a 1000 watt. When she went in at 15" and in the 4th wk she was 4 1/2 ft with budsites just forming. In the 7th wk she was 5 1/2 ft then She was tied down. She went 12 wks lol. She yeilded 1 1/2 lbs.
BTW- I did not top her once. (should have)

Jdzzl03:
Check your roots out and see if they are brown and slimey. They might be a slight brown but that can be nutes or build up. If they are slimey then that is a sure sign of pythium infection. It is caused by low Dissolved Oxegen (DO) levels and also unsterile equiptment. Add as much air in your res as possible and add H202 like this.

For severe problem (pythium/root rot) for 1 gal.
24 hour flush
3%-12 ml
17.5%-2 ml
35%-20 drops 1ml

Now add a very weak nute solution w/
3%-11ml
17.5%-2ml
35%-16 drops

Up your res changes to 3 days slowly increasing ppm.

Daily topping-
3%-5.5 ml
17.5%-18 drops
35%-9 drops