I only have one tank on the go mainly (sometimes I set up a breeding tank, but that's another story) I keep a diary, I keep track of what I spend, when, what I do when, test results etc, when and what they were, why I did extra tests... cleaning (I record if I needed to clean the glass more etc...) water changes etc... then I can look and say... hmmm, this caused this... so to speak.
the diary itself is just an exercise book. every entry is dated.
one of the things I keep a close eye on here, is the temp of the tank, in summer i can have issues with it getting too hot.
Last edited by paddles; 11-03-2011 at 10:18 PM.
Reason: add temp recommendation