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Both John and I record our water parameters, maintenance activities etc in a little book which we complete after each water test, when items are due for replacement etc.
Over time this gives us a very good representation as to what is happening in the aquarium, any trends which can be identified, trouble which can be potentially averted prior to it happening etc.
This is the way we do it and a lot of other aquarists all over the world do it this way as well.
Of course there are some people who do not record any information at all. The water is simply tested to check if everything is ok. If it is then it is simply forgotten about, if it isn’t then steps are hopefully put in place to locate and rectify the issue.
As with anything there are other ways in which you can record the information. One of which is via the use of computer software.