Wow, thanks for the compliment Canoe2Can. I try to stick with "simple" and not use more than 1-3 species of plants, and the same number for fish species.
As for the heaters and filters...I don't currently have a plan for them, but I would like to. I've never owned a canister in my life (can never pull the trigger and fork over the cash for one) but I may if this tank turns out well. The Duetto on the left is just for water movement and a small amount of filtration in the minimal sponge housed in it, and the smaller on the right is for CO2 dispersal (the line from the pop bottle plugs into the air inlet on the filter head--works GREAT for getting CO2 into the water column as the impeller dices up the bubbles and pushes them into the water).
And Geometry was one of my absolute worst classes in high school, so the whole "golden triangle" thing is a bit too much for me. Instead, I try to take notes and cues from nature and focus more on relationships structures have with one another (wood, rocks, rock size and distribution in relation to their place in the stream, plant growths, where fish tend to inhabit and congregate based on these relationships, etc.) and things end up turning out fairly well.
"I go right into the aquascaping without any design."