Tahitian Moon Sand is black and would look nice with Multies. I think a 15lb bag is the way its sold here and that would be fine for a 20g Multi tank.
Multies don't need much sand at all....maybe a 1/2" layer, so you don't need a ton of sand (saves you money!). Shells are more important to them.
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*Kristin*
5 Planted tanks:
55g, 40g, 29g, 10g, 5.5g
10g N. multifasciatus tank, 5.5g Platy fry
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