Just Bought 20L from Petco (Sale)

[PhishMon84]

lol they are awesome!

 

[Milingu]

Thats a little steep for 1 fish and i want like 12 of them

If you want 12, forget the ocellatus. They will just kill each other in a 20gallon.
This amount of shell dwellers in a 20 gallon will only work long term with N. multifasiatus or similis.