I'm using a App on my phone called aquaplanner pro which I have had for around a year now and got to say it as been good
It will remind you that your water test are due and once you have done them you can sore them for next time and see if every think is stable in your tank
You can add all your fish and corals to it and keep a eye on how they are growing and if you lose any fish this can be a good thing when you are looking in your tank and can't remember what you have in there.
This works for me
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