i don't see why a cary couldn't live on sand. that is prolly the substrate that they live on in the amazon. the smallest cory is called the pygmy cory. they max out at about 1 inch. If you can't find any pygmy cories, panda cories only grow to about 1 1/2- 1 3/4 inches long.
What size tank does your friend have? be sure to tell him that cories are social and look and act better in schools. 3-5 should be fine. what other kinds of fish does he currently have in the tank or what is he planning on putting in the tank with them?
Andrew
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I think about you in the summertime
And all the good times we had, baby
It’s been a few years and I can’t deny
The thought of you still makes me crazy
I think about you in the summertime
Summertime - New Kids On The Block
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