I have a spare demijohn and stumbled across this Instructable. It seems to suggest you could effectively have a viable shrimp nano in a bottle without any filtration. This is counterintuitive, based on everything I've learned about aquariums, but other than Amans in a planted fish tank, I have no experience of shrimp, nor of nano tanks.
Does this seem a little too optimistic, or worh a try?
Does this seem a little too optimistic, or worh a try?