Couldn't you tell by their behaviour if they were feeling secure?
would therereally be no behavioural indicators if the habitat was to small and causing stress?
And right now, I only have 3 tanks on te go, so maybe that will allow me a little more energy, time and willingness to ensure the health of my specemins..
In any case, if the experts here agree that a 12ap would suffice for a pair of dwarfs, then I can go ahead to the planning/research stage.
Thank you for your advice and support.