I never said it was turf alage, but now that you say that it might be.Oh. From the pictures, I thought it was GHA not turf. I missed that, sorry.
For turf, I'd lean more towards Vibrant, reserving Flux for bryopsis and hard GHA resets.
The flux I've used comes in powder form with small scoops to measure it out by gallon volume. But you should be able to find the capsule conversion with a google search on reef2reef or RC.