It's very fine Unipac sand and there is 3-4cm of Tropica plant substrate underneath it.
I prefer sand and I am going to keep Corydoras, and they have to have sand for their barbels.
Also sand is as much a substrate as gravel is, so I don't know why you say "use a proper substrate".
I had white sand in my previous set up and it was fine, though you aren't restricted to 'just' sand if you wish to keep corys. The only issue I found with having sand was that you can get a certain amount of material / debris build up within the middle to bottom areas, though this never caused any issues. Although I'm sure this is a natural occurrence, it just doesn't add to the overall look / appeal of it.
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