Definitely overfeeding due to the copperband. I've never had levels this high in all my fish keeping. We're fairly lightly stocked with this tank.
When I say rinsing the media, I meant in some tank water during water changes. The bags just look like they could use a rinse.
I got a big batch of water made and will be doing a larger than usual wc today.
In your first post you said you do weekly water changes of 20%-30%. What are you using for nutrient export other than Seachem Tidal filters? NO3 in the 80-160 range and PO4 in the 0.4 range is extremely high. I think it would be hard to overfeed a tank enough to get those levels while still changing that much water on a weekly basis.
A full rundown of all your parameters would be nice. You haven't given Alk, or Calc readings and unless your NO2 and ammonia readings are 0.00, they are not fine.



