The tragedy of Cubicle Fish

So about a month ago I went to a coworkers cubicle and saw he had an aquarium with some fish in his cubicle. I thought "brilliant!" Kenny doesn't particularly like fish, so we don't' want them at home, but a cubicle is a perfect place. So we went to walmart and spent $30 of my $60 allowance on a ten-gallon tank kit (complete with filter and lights). I then went to petsmart and spent $30 on accessories- gravel, a fake plant, a decorative barrel for fish to hide in. I bought 3 fish at 5 dollars each.
Billy (joel) Fish was a tannish gold with a black pompadour and a "you lookin at me?" kinda face. Dizzy (Gillespie) Fish (aka bubbles) was a standard gold fish with ridiculous bubbly huge cheeks. He looked like a pretty miserable soul- that type of fish always looks sad- and since I am a horrible person, it makes me giggle. There was also Jerry (garcia) fish, who had a big pot belly and was a little spazzy. Lori was kind enough to accompany me in the picking out of these fish then went to work with me on a saturday to get it all set up in my cubicle. That was just over two weeks ago.
The first week was great. Others have since copied the idea and there are now many cubicles with fish, but mine were still the coolest. They made me feel more at home and kept me company during conference calls (which take up about half of my time).
Then last Thursday, I started noticing they were swimming pretty slowly and not doing much. Friday, they didn't bother eating. About half way through the day I went to feed them, and when I opened the lid I noticed a bad smell. Then I realized I hadn't seen dizzy fish all day. So I reached in, turned the decorative barrel upside down, and found his corpse.
By the end of the day, Jerry fish did nothing but chill at the surface, frantically gulping. Billy was the worst though. He just floated, kinda crooked, and I would have thought he was dead if his eyes weren't moving, looking at me with this "what have you done to me? put me out of my misery" look. I turned off the light, thinking the water might be too warm, and turned off the filter, thinking maybe it was causing too much current. They were both still technically alive when I went home on Friday, but it didn't look hopeful.
Sure enough, we came in on Saturday to check, and they had both passed on. All three fish were laid to rest in stall #2 of the women's first-floor restrooms.
I cried all day Saturday and still struggle, seeing my empty tank (yes, I cry over goldfish). Everyone here has been so nice about it- at least 6 coworkers came by to offer their condolences, and one even brought me goldfish snacks (how thoughtful!)
Eighty-five dollars, three fish, and many tears later, I think I've decided cubicle fish weren't that brilliant of an idea.