I have a 55 gallon tank and was planning on making it into an authentic amazon tank for a shoal of 5-6 piranhas (i know ill pry have to upgrade to a 125 gallon once they start getting bigger). My question is what will i pry all need substrate type, rock type/driftwood, plants, filtration, heater, powerheads, lighting, etc. to make it as authentic as possible. any advice would be helpful.