It's not really gravel but I don't know what it’s called, good to know though!
If I go with just sand does it matter what sand I use?
I used two types, that was a mistake. Go with something from the fish store, expect it will not be cheap. It lasts forever.
 
I've only used sand. Personally I love it
I've used both, much prefer sand.

NOTE: if you have a mechanical filter (with an impeller) either keep a prefilter on the intake tube or turn off the filter when stirring up the sand. Sand damaged my OTB filter's impeller. Now I have mostly sponge filters, so no sand damage.
 
IMG_2065.jpg

Here's my 15g setup, from 2020. I had an Eheim Liberty 200 OTB filter, but used a prefilter on the intake tube.

The sponge filters are less work, easier maintenance, and I have no fear of sucking up fish into the impeller :hit
(yes, I killed a couple cories that way)
 
I used two types, that was a mistake. Go with something from the fish store, expect it will not be cheap. It lasts forever.
I actually should be able to go to the petshop today, so I'll see what they have. I also want a sponge filter, hate the filter I have.
 

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