A: Once you have done your research on the fish that you want to buy, you need to make sure that you have the proper environment for your fish to live in. That means having a healthy, cycled tank for them to go into. It is good to have a spare tank set up, so you can acclimate your fish to your water before adding them into a community tank. Always use aged aquarium water with healthy bacteria in it. Discus thrive in aquariums equal to or larger than 75 gallons.
