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once you have all you need the monthly cost is not so bad as most dosage is only a few drops, zeolith rocks changes are 6 to 12 weeks depending on the load in your system, you can use just the basic 4 and water changes to get great results, save the stuff like spur2 for when you are well into...
Before I started zeo and now not a huge difference in sps color, some acros look better and some not as good. Its just another way to keep nutriens in check, there are alot of zeo produts that influence color.
stan
I see lighting as a factor in coral color but not the whole reason, the most important is water quality and balance. I have seen corals color up under most any lighting with good water and water changes of 10% per week. Less is more, to much of anything will darken tissue. HTH.
stan