Well absolutely can do without doing a water change.
Absolutely can do without my Apex controller (it's just a glorified timer at this point in my system).
Absolutely can do with washing filter socks
All my fish eat seaweed and have an ample supply of that.
Have enough filter socks for a few months and can revert to cleaning them if necessary.
Can live without a skimmer as long as I have filter socks (can use alternative methods to decrease nutrients).
Cannot live without my Alkatronic and hope is doesn't kick the curb.
Do not need much as far as dKH/Calcium/Magnesium (running a calcium reactor with spare CO2 tank).
Have at least 2 months supply of Red Sea program maybe even longer.
Cannot live without a return pump (will order a spare just in case anyways and the one I use is readily available online).
Have a Sochting Oxydator running on system so oxygen not a concern.
All in all I think unless electricity miraculously stops working that is the main concern. Do not have a generator. But if power goes my fish tank will be the least of my concerns at that point. Then we are talking REAL doomsday type crap at that juncture.
And yes unfortunately my tank is more prepared for this than I personally am. Sad but true
