I will say that if you can, buy the Peace River Gravel with the water conditioner and bacteria already in it. It's worth the extra couple of bucks to be able to put it straight in the tank without rinsing.
The particle size is perfect for planted tanks. South American cichlids and other larger fish will also like this because they can move it around with their mouths or bury themselves in it. This will not clog the gills of these fish and does not settle too tightly for plant roots. In the past I would use blasting sand with Fluourite or another plant substrate mixed in. Cleaning is easy and it is not likely that it will be sucked up during gravel vacuuming.
If you have to buy gravel off the internet, this is the stuff!

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