very hard to know what sort of sand it is, other than it looks like sand from a beach rather than a river. I've used East Coast Play sand, West Coast black sand for my loaches and corydora (not kuhlis) and all have been fine. Some buy 'Play sand' and some are lucky to live near a river to get river sand. I'd say that river sand is likely to be sharper if it's made of ground up stone, rather than silica.
If you can't find any, see if there is a landscaping supply shop, up here we have a chain of stores that all sell a range of different sands for about $10 per 20kg or so. Some will give you a sample, and if you go after it's been raining you can see what colour the sand is when wet.