Sand is Wonderful
Sand is my favorite substrate, over time the fertilizers, the nutrients enrich the sand, the roots easily work their way through the substrate and becomes a powerful biological filter as well.
It sounds like a very nice tank and you have a good start.
Two to three inches of sand is ideal, do not worry about it if you didnít start that way. Adding substrate is a mess and if you wish to make a change it generally just as well to re-scape the tank, start over.
If your Guru tells you otherwise and you are true believer that is okay I will not argue the point.
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I pretty much limit what I say to things that anyone can easily verify from recognized references or by direct observation. If it is my opinion I say so.