I am so glad I took the time to read through this thread. That being said I didn’t read every single word/link, so if some of this has been covered: my apologies.
So I’m one of those guys who will catch fish, kill fish, and eat fish any day of the week. My dogs and cats eat fish as well. My fish eat fish. I breed fish just to feed to my other fish. The dogs, cats and Pleco fish all chew wood.
Except for my prize Oscar it is pretty hard for me to cry about the feelings of a fish.
I keep four aggressive cichlids In a tank with lots of defensable structure. I move it around like a chess game every week when I clean the tank. I think it keeps them from being boring. They have to figure out the new “ropes” frequently.
Just so the pressure never really comes off of this little society, I also keep three Plecos and an upside down cat. You can see the biggest one, bottom front & center here.

I had big expensive Bogwood in this tank as decoration, but it was ruining the pH.
So after I took the wood out of the 125, I found that the Pleco’s were just fine; but eventually I noticed that they were doing this to my sponge filter.

Look at the dark guy on my albino. He is sucking it down.
So I’m one of those guys who will catch fish, kill fish, and eat fish any day of the week. My dogs and cats eat fish as well. My fish eat fish. I breed fish just to feed to my other fish. The dogs, cats and Pleco fish all chew wood.
Except for my prize Oscar it is pretty hard for me to cry about the feelings of a fish.
I keep four aggressive cichlids In a tank with lots of defensable structure. I move it around like a chess game every week when I clean the tank. I think it keeps them from being boring. They have to figure out the new “ropes” frequently.
Just so the pressure never really comes off of this little society, I also keep three Plecos and an upside down cat. You can see the biggest one, bottom front & center here.

I had big expensive Bogwood in this tank as decoration, but it was ruining the pH.
So after I took the wood out of the 125, I found that the Pleco’s were just fine; but eventually I noticed that they were doing this to my sponge filter.

Look at the dark guy on my albino. He is sucking it down.