Hello,
I log everything on my computer like in excel format but print them and put them in a binder. However I do it for other reasons. I usually know where my tank is by looking and have been wrong a few times but not often. But the main reason is, if I’m sick and can’t be home or hospitaliz d etc vacation, there is a log for any one else to follow.
It says how much I manually dose each day and of what etc. it also says how often I feed the corals and fish as well as schedules.
Also in that log it says where the main heaters are plugged in, skimmer and which power strip runs pumps and which one runs lights. Each power transformer I made a label saying which one it goes to etc. now I had super pretty cores and wires till I had to replace something. Then it was a huge pain getting the cord out, but not so much in finding it.
Logs are great for that sudden emergency where someone else has to do it for me. I also write it, basically in terms that my 6 yr old niece can understand. Too many people who don’t know saltwater it’s mind boggling.
The other reason is it helps me do the math when for example I’m out of the sceechem alk powder and only have rpm liquid concentration. I have to convert that to make sure I get proper dosage or my tank goes low or high in a day. But I’d do what’s best for you and how to help you maintain your tank. Super simple has always worked wonders for me.