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My advice to SPS keepers:
Focus on water quality. If you have high nitrates, phosphates, or other chemicals, but little chaeto growth, this is when you should be concerned.
If your water quality is good, who cares if your chaeto is growing. Focus on maximizing coral growth, not chaeto growth.
I will give you one example of when fertilizing an SPS tank is good. I had a friend with a beautiful SPS tank which had high phosphate levels. The tank was starting to get hair algae. The chaeto and caulerpa in his fuge wasn't growing. Why was the hair algae growing, but not the macro? Without getting into a biology lesson, we needed to add nitrates to the tank. Nitrate and phosphate levels were tested daily. Nitrate was added over a 2 week period. Nitrate levels in the water were never detectable, but phosphate levels slowly declined. Macro growth was rapid and hair algae disappeared. Hope that makes sense.
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