I know quite a few people that keep discus fish in heavily planted tanks. They are a bit more sensitive than some of the other species that you can get out there but not as hard to keep as some people make them out to be. I wanted to get discus a couple years back and did a lot of research on them and got discouraged after reading stuff about how you have to do water changes daily or several times a day and you can not have anything in the aquarium except fish and water. Then I did some more research and found out that discus can be pretty hardy fish!! They are able to adapt and will slowly adapt to your tank parameters. What made me deiced to try my hand with these fish is the fact that I got obsessed with the discus fish shows, and then I saw a behind the scenes video and got to see how some of the fish are kept in small plastic bags for hours and then put in a half sized betta bowl for several more hours and survive, so they are a bit more hardy than people make them out to be. The main thing with discuss is you cannot be lazy, you will need to preform regular maintenance and care must be taken when adding anything new to the aquarium, they require a little bit more care and attention than other fish but that makes them seem like more of a pet to me.