Both would be fine IMO.
I have a 10g with a male betta and 6 harlequin rasboras and it works great. The 6 Serpaes will be fine in the 10g until you upgrade. I just wouldn't keep them with the betta.
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*Kristin*
5 Planted tanks:
55g, 40g, 29g, 20g, 5.5g
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