Greg wrote on 06/03/12 at 08:22:40:arteacher wrote on 06/03/12 at 05:56:41:Science Fiction from late childhood to middle age. I firmly believe it kept me away from the drugs all my friends were doing when I was a teen.
Photography- I was a pro and taught it in the '70's- just dabble now.
Audiophile all my adult life, building some of the equipment.
Gas powered model aircraft- in my youth and early adult life.
For about 6 yrs I was heavily into fresh water aquariums, breeding and selling different kinds of fish.
And now The Bike.
I used to consider myself an audiophile on a budget. Now I can't hear nearly as well as I did 15 years ago so the importance has slipped. I still own decent consumer stuff though.
I went through the aquarium thing, though not to the extent you did. I neglected it so bad that I was breeding SOMETHING in the tanks!
I am 62 and can still hear 14000 cycles on a good day. Before I dropped the dime on the speakers I have now I asked on an audio forum if they were worth my while at my age and quality of hearing. Good speakers do a lot more than reproduce the frequency extremes, I was told. They reproduce better ambiance, image better, have better dynamics etc., etc.
So I bought 'em and they did sound a lot better even though I could not hear the highs that my previous speakers did not have.
The best tweak I ever did was to put dedicated power circuits, with isolated grounds, to the components, eliminating all the noise on the household power supply.
Dead quiet background now- no hiss at max volume at all.
As far as breeding stuff in an aquarium, I left a 35 gal alone after the last fish died- for 5 years now. It grew some interesting stuff before the water evaporated to the point that the remainder was so "hard" that nothing would grow.

One of these days I am going to start it back up and put some "easy care" fish in it to inspire my grandson, who has shown an interest in fish. He has two small tanks, one with a beta, and another with some platies. He is 6.
Oh.... and you are always an audiophile on a budget unless you are filthy rich.

In th early '70's I priced out the most expensive system you could buy.
It was $65,000. Now you can spend that on a couple of cartridges for your $200,000 turntable.