Does anybody know HOW they tend to make thease aquariumjs look like this? i myself have a nicely done havily?

heavily planted tank, and i have driftwood, but i am not sure as to HOW they do this. h0ow do they hide all of there equitment? get there water this clear? how do they keep the constant shape and everything. i realise the nicer tanks are the ones with only one type of schoaling fish, usual some sort of tetra, and the rest arnt really noticeable (clean up crew fish). anways, i love the aquascapes here that look like out-door scences.... http://showcase.aquatic-gardeners.org/2008.cgi?&op=ishowcase&category=0&vol=3