Hi,
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" Is Coco the best growing medium? "
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I think so, but I'm prejudiced.
Coco has a great structure, always has a lot of air in it, and it buffers to the right ph, unlike peat. No need to add lime. All you need to do is ph your nutrients to around 6.0, and you're fine. Easy to flush. In fact, if you make sure you have 20% runoff every time you water/feed, you probably never need to flush.
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" Is there a better Coco product to use than another? "
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Yes, I use Canna Coco. No need to flush, you can use it straight out of the bag. Some brands still have too much sodium in it.
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" What needs to be done differently (nutes, care, etc..) for the Coco? "
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I have just had success with the easiest grow I ever had - a Lowryder F2 autoflowering plant in coco. No lights, just put it on my balcony and watered it every other day.
Because it is so much like hydro, you can very carefully control nutrient content in the soil.
Monitor runoff, and adjust your nutrient strength by the runoff. If you want an EC of 1.2, and the runoff is 0.8, feed with a nutrient solution of 1.6 (which is 1.2 + (1.2 - 0.8)) until the runoff is at 1.2 EC. Very easy to do.
These numbers should be
in addition to the water's EC, which in an mineral based grow is inert - i.e. not available to the plant. So if you want to water with a solution of 1.6 and your water's EC is 0.5, your solution should be 1.6 + 0.5 or 2.1.
It flowered on it's own, with very proliferous resin formation. Great smoke too. The nutrients used were inorganic Canna Coco A + B.
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" Are there specific nutes that need to be used for optimum growing? "
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The easiest would be to use the nutrients that go with the brand of coco you use. I would say Canna Coco with Canna Coco A + B.
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" What about the Coco wetting agent? Are they necessary? "
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A coco wetting agent is simply a wetting agent that is used in foliar feeding to make nutrients stickier to the leaves. Or to reduce water resistance of dried peat. It has nothing specifically to do with growing in coco coir, it is just coco oil based.
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" And I would like to know if we can process available coconut husks into usable medium from our trees. "
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I'm sure that would be possible, but it would be more work involved than is necessary. Cocos has to be flushed because of sodium content. And there are various processes involved in order to maintain the right structure. Why process your own if you can just buy it in a bag? Unless you need lots and lots of it. Coco by the way can be re-used several times.