great list.
ill add a couple.
1. never give your wife or GF number of LFS ... she will call to ask if ure there, when u tell her your on your way home lol
2. There is a possibility of everything failing. if pipes and joint of tank fail, you will get limited flood [amount of water the tank holds] but if a live water pipe fails, you will have unlimited water to flood [my RO tube somehow got disconnected from the float valve ] now I have it in a tub.
3. when something goes wrong at the middle of the night, or as you are getting home ... DO NOT PANIC. take a breathe first, plan out your actions for the next couple of mins or hours, then proceed. many times I have tried to remove the light, hold the extension court, and dig something out of the tank .. and many times I have made mistake of putting the hand holding the light or extension cord right into the tank ... or went to remove something fast, and broke something else nearby making it even worse ...
4. when going on vacation, label everything, and make more than enough RO/DI water. you dont want to be on the other side of the planet, and get a call that the sump is empty ! fish watcher will have a REALLY hard time replacing your dead return pump and making alot of RO/DI water [Made less than enough RO/DI water, it ran out, sump level went too low, pump was running dry and so on ... my friend had to bring the LFS owner to my place to get it replaced, as he couldnt figure out the pipes ]