I have had my 72 gallon bowfront tank set up with tropical freshwater fish for about 9 months and I am wondering what the costs and difficulties would be in converting this aquarium to a planted tank. I have read a few threads about planted tanks and I am so confused. Do I have to remove my fish for a long time to set the plants up? Do I need to buy new substrate, a CO2 diffuser, and new lights? What nutrients would I have to add to the tank? any advice would be very appreciated.