Between the filter, co2 reactor, fire extinguisher, nets, buckets, foods (including galaxy that I hide from my wife and feed to her when she's miserable, but mainly flake and pellets), lighting ballasts, tubes, pipes, power splitter and the large wooden struts that modified a likely looking cupboard into a likely looking stand I have no room whatsover for my whisky. That I hide somewhere else.
Oh and seachem prime, and some mineral mixes to remineralise RO water.
Oh and a bag of carbon and a bag of filter floss.