Even if you are not working in the kitchen etc, it is always a good idea when handling larger quantities of chemicals ( like say when you are mixing up the metal salts), to have some form of additional containment in event of a spill.
Take a walk through a department store for some suitable plastic storage containers. It may take a while to find something with a flat bottom. You should also be able to find something larger to serve as secondary containment for trays.
I suspect you must already be doing something like that for negs in you kitchen.
As people have said you space does not need to be anywhere near dark for alt.
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