See that's the thing. No one knows, you have to figure it out lol. I assume Since you dont have co2 (excel doesnt suffice) you only need the light on for about 6 hours ( I would start with that and see what happens) and about a light tap on the pump of thrive. For how often a week for thrive, that's for you to find out. On the other hand, If you were to have co2, one full pump a week would be fine since you do about 20 gallons of wc a week. Ontop of that, you arent heavily planted so like I stated before, you dont need alot of ferts . Itll just create more problems.