Define light dosing of ThriveS? Amount and frequency? Itís already a light fert formula so no need to go less than what label calls for in most cases.
One thing youíve not hit on is photoperiod and lighting used? I could assume stock light at 6-8hrs a day but you know what they say about assuming.
Light, nutrients and carbon all need to be in balance. In a 5gal spec, running 6hr photoperiod and added co2. Iíd probably be adding at minimum 1 pump of thriveS 3 times week(every other day).