Thank you Corsair, Brookster, mebbid & all.
So at this stage it's either return the fish and finish "fish-less", or return the fish and start adding my intended occupants. None of them are what I'd call "hardy" so hope I'm not taking too much of a risk?
My final stock will consist of 6 Purple Pencilfish, 5 Sterbai Cories, 3 Otocinclus, and 7-9 Green Neon Tetras/Neon Tetras.
Out of the above stocking plan, I'm thinking I could start with the Sterbai Cories, does that sound reasonable?
Thanks again everyone, I really appreciate it