i have grown my own amazon swords plants for years from a single motheer plant in a 20 high. its the centerpeice plant and no, it is not too big or anything like that. if it gets big, then you have 2 options. divide it and sel the other half on ebay or trim the plant down. either way works and has worked extensively with me. i use excel, florish, and planttabs for nourishment. it thrives under the 2.5 wpg and has grown into quite a plant. the lighting is key with these plants though- they will get large under the right conditions. one big plus is that the root system of my mother sword is so extensive that i have no need to siphon the gravel in the areas close to the roots and stem! seriosuly- all other places the gravel collects debris and fish junk as is typical, but theradius around my sword is always immaculate. plus the plants are tough and resilient even to fish who nip at them. i have tried all the other plants, but by far my favorite is the amazon swords. all other plants break up too easily during prunings or tank cleanings. in my opinion as a sword lover, propagator, and grower, i would get one medium sword and let it fly.