Kuhli loach group size

What is the best group size for kuhli loaches where they are comfortable enough to come out of hiding but isn’t to big to where it still fits in a 24x12 inch tank (juwel primo 70) and the tank mates are some Amano shrimp cherry shrimp a female betta (probably a koi betta if that makes any difference) and celestial pearl danios.