I depends what else you have in the 10 already. But generally speaking you could have 3 in a 10g.I mean ottos I here'd you can keep 3 In a10g
So...they order them every week and sell out of them by the weekend every week? Umm.....why don't they order more at a time? Probably not a question or answer you have any control over but it is pretty odd behavior from a retail store.I can only get to my LFS on weekends and stock comes in on Mondays, so they always are sold out