Hi,
I keep records using excel also, it has become a useful tool. But personally it takes up time and is a hassle but worth it. I normally record info such as hatchings, if I bought fish/eggs from whom etc And also any disasters I might of had.
I have not got it down to how many of each fish I have, unless it is just a couple, although when I can get that information I will update my lists.
But it is good in that I can see who are good to buy from for example, or which methods have given me the best hatch rates for eggs. And just to keep track of how many species I have - confidential 
But I can see things at a glance like who are consistently good to buy eggs from and who to steer clear of. I also keep track of what I pay for them, I think more mean Scottish blood so I can see if I paid too much or not on aquabid
I also keep track of any purchases I make with my fish, tanks gear etc to stop myself from going over board and buying too much.
I also use lots of white labels and markers and most of my tanks and containers have quite a lot of scribble and writing on them, so my excel is a secondary more complete record. But all my fish I normally know exactly how old they are and where they come from - and most importantly the species and location details.
Scott.
Thanks again,
Scott Douglass
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