Hey nok,
as lynne posted in the opening post, you should be able to quarantine all 5 of the little guys together in a separate, more simple, quarantine tank. Since they lived together at the store, chances are if they have parasites or anything else, in theory they will all share the critters together since they live together already. You just should and taking all five of them and putting them directly into your new clean viv. Quarantine gives you the chance to get to know them, monitor them closely , watch their eating and pooping habits.

Does that help clarify? Hope it does. Have a great day!

Lisa