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I think 10 might be a bit heavy on your bioload with a betta so I'd go with 8. Pygmy are smaller so I think you might get away with 10 but someone who has this specific type will be able to help more. I have the larger Bronze cory which grow to 3 inches.

I have play sand in my tank with my Bronze cories and they love it! It's actually quite lightweight and not sharp, a lot of people here have play sand with their cories. I've had no problems with plants being uprooted by my cories. I think cories will help reduce gas build up but I'd still stir it up once a fortnight to a month. (better safe than sorry)
 

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To be honest, Kyon only takes notice of my corys when I feed them their cat fish pellets. He will follow them, hiding behind plants like a spy until they find something nommy then he will nudge them out the way and snap the food up!
 
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