This story starts the November before last. I work in a pet store, and a shipment of female guppies came in. One gave birth to thirty offspring and promptly keeled over. There's nothing quite so pathetic as thirty itsy-bitsy transparent fish--they looked like puppy eyes attached to spines--so I took them home before they got eaten. I popped them in a three-gallon tank left over from childhood fishkeeping adventures.
The guppies grew, as guppies as wont to do, so I got a slightly larger (and better-looking) tank with air-pump based filtration. I also got a scarlet betta female to eat the now-mature guppies' own babies. I loved this betta; her name was Killer, and she was my first actual purchased fish.
Pretty much everything after this can be traced to that, my love of Killer.
Bettas don't like air pumps (the bubbles create too much motion in the water, and their aggression is motion-triggered), so I was on the look-out for a tank Killer would like better. A 14-gallon Biocube went on clearance at work. It was pricy even on clearance, but it was so
nice. Fancy filtration in the back, powerful lights, a whole lot more room than my current tank. Lights powerful enough to grow plants. Enough room for schools of tetras, another group of fish I like.
Well. The guppies killed one another off (the females by breeding till they wore themselves out, the males mostly by ganging up and murdering one another--I have one proud, ragged-finned survivor left), and Killer in the stress of water-polluting guppy deaths contracted fin rot and died. (That was the first time I have ever cried over a fish.)
But the plants remained, and the tetras, and I had succumbed to the love of the hobby.
I tinkered with the tank. I added a carbon dioxide supply, for the plants. I put in a more powerful pump. I added new fish. Soon that demon thought entered my mind, as it does every aquarist's:
I need another tank. A bigger tank.This Christmas brought permission for that tank, and so I promptly went out and got the 29-gallon Biocube. This time, though, I had Plans. I had a hacksaw. And I had a camera.

We begin with the plain empty tank. It came with a full black hood, in which the lights and cooling fan are hidden, but I took that off. Next order of business: making the tank rimless.

I had to cut through the black plastic rim, then run a razor blade through the sealant and pry the rim off, then very carefully scrape the remains of the sealant off the glass. Behind the rear partition, where there are three compartments, I made a variety of small modifications to alter the filtration and flow to my taste.

Next comes the substrate (black EcoComplete, which my plants loved in the 14-gallon tank), along with driftwood and some decorative rocks. New driftwood tends to release tannins, which makes the water both tea-colored and a little more acidic. You can soak driftwood in a bucket for a couple weeks, changing the water out every day, to leach most of the tannins out; you can also boil it if you have a pot large enough, and don't care about the pot making anything else cooked in it taste like driftwood. I keep tetras, which like soft acidic water, so I stuck the driftwood in with only a single good rinse. (The most common tetras you see are from the blackwater streams and pools of South America--tannins taste like home.)

I decided to go real fancy and get LEDs for lighting, which are more expensive but longer-lasting than the high-powered fluorescents you need for most aquatic plants. Right now you mostly see high-quality LEDs in marine tanks, especially for people who keep corals. The LED tile I got is specially calibrated for freshwater plants, which use different wavelengths than coral.
I also hooked up a pressurized CO2 canister to inject the tank with an even supply, because if you hit a planted tank with lots of light and lots of nutrients, but no carbon dioxide, all you're going to grow is a whole bunch of algae. Planted tanks are a high-wire act: any change in nutrients, water quality, CO2, and possibly the socks you're wearing can trigger outbreaks of strange and terrifying new algae. It's a lot like keeping saltwater, except prettier.
(Sorry, those who like saltwater. Corals are nice, but for me they'll never beat a joyfully bubbling carpet of microsword.)

This is the tank a week ago, fully planted. The grassy bundles you see are microsword, which will expand into a little lawn across the bottom. The back left corner is Amazon sword plants, which will grow all the way to the top of the tank. In the back right, we have a mix of java ferns, dwarf sagittaria, pygmy chain sword, hygrophila, and (the biggest one) an unidentified variety of cryptocoryne. That should eventually expand into a huge leafy mass of green.
The tank right now:

With bonus blurs of Congo tetras (the greyish ones) and flame tetras (the yellow-orange). Still a baby tank, but in forty days it will be well on its way to lovely.