If I end up harming my fish, I couldn't have done anything differently than what I'm already doing. Where my spirit is willing but my body is failing me. Maybe my methods aren't up to your standards but the fish are thriving, so I think I'm on the ball as far as my care is going down.
I intend to learn how to use an advanced water testing kit and learn how to improve my water chemistry parameters. But if anybody wants to volunteer their maguiverig skillz and time and energy doing water changes for me, I'll say come on over and do it! It seems to me that I'm expected to have a permanent fresh river reservoir pumping directly from my bathtub otherwise I'm a "non-compliant" aquariest.
I think my methods (even if I can increase to 20% water changes) should be adequate to support 2 or 3 various young discus. My fish/pet supplier thinks my setup and efforts is adequate for my small scale ambitions.
I'm open to suggestions about how to feed or care for the fish within my limitations. But to be told that I should not own a discus if I don't follow this specific regiment is not constructive advice.