How long has it been in that pot? It looks/sounds like enough but if it was put in there too early or if it's been in there for a while it could become rootbound. When it is dry/ready for watering pop it out and take a look at its roots. If you see a massive cluster of root growing round then you have your answer. Personally I notice other signs when plants get rootbound, such as limp looking leaves at the end of the day (which is normal to some degree but worse when rootbound) and needing to be watered more often.

Don't do anything in the extreme until you have it figured out. Keep up with the biobizz grow, just not as much. 2-3ml per litre should be fine.