Buds are not as big as I'd hoped going into the 6th week of flowering. Not sure if it's got anything to do with it, but it's been quite warm this week. It's cooling down next few days so hopefully can get the temp back down below 30c with the lights on. A couple more of the lower leaves have yellowed and dropped off, and now there's a clear canopy area between the leaves at the base of the colas and medium, which should help with airflow. There's been no noticeable vertical growth beyond colas getting taller so I've dialed the biogrow back a bit more, and will probably stop using it all together from next week onwards.