I have been using cocotek blocks and fiber mat for my last 2 grows. It is much better than rockwool cause I don't have to mess with the PH too often. The plants seem to like the coco fiber. The fibermat has anchored the plants down with their roots so have not any problems with plants tipping over.

I water every 3 hours for 15 minutes when the light is on.

My girls are few weeks from harvest.

Hope this helps.