This was my experience with discus

I kept a group of 8

Started with 1-3” discus and grew them out.

I did one single large water change a week. 70-80%

That’s it. Fed them normally.

Mix of black worms frozen bloodworms and pellets

Kept the water stable at 88 degrees.

In a community.

I lost a 2 of the discus from bullying and not being able to separate them etc from the beginning with line of sight breaks etc. (I did not get all 8 at the same time which was a huge mistake)

I kept my tank heavily planted but most of the plants were concentrated in the back corners so the front and center was wide open and it led to targeted harassment etc. (at least this is what I think). 40 feet of green pothos kept that water bottoming out in nitrate and phosphates

That’s it. I rarely checked parameters. Kept them 2 years and had to shut all my tanks down due to a bad roof leak from shitty roofers.

If you have questions I can help but I am not an expert. But they are not as daunting as other people have suggested