Hello, Paul.:)
You know I have nothing but respect for you, but it wouldn't be right to have a thread like this without the input from the other side of the box. Doesn't look like anyone else will do it, so here goes........ LOL
The argument could be made that it isn't the modern hobbyists that's living in a box. Most people today manage their tanks based on decades of people thinking outside the box and coming up with new, different, more efficient, or "better" ways of doing things. Through thinking outside the box, equipment, and techniques, have changed and evolved over the years. You're still doing things like we did decades ago, so one could say that you're the one not thinking outside the box.
I've got well over 30 years at this. Not as long as you, but longer than most. I've seen many changes over the years. My first tank was ran very similar to the way you run yours. Started with air powered UG filter, then upgrades to maxijet powered UG, then reverse flow maxijet UG. I built my first skimmer, that was very similar to yours. It was 6' tall, and 4" in diameter. Used a little Giant pump with a waterbed fill and drain venturi. I used a Christmas tree stand to hold it up vertically, and an upside down pickle jar on top. We didn't have much of a choice but to build our own back then. Reef Octopus and Deltec didn't exist.
I kept fish and coral alive and well in this old system. Even had Goniopora stokesi and rock/flower anemones reproducing. Even had Elegance coral, ocellaris, and royal gramma spawning. Back then, I was young and VERY egotistical. I thought I knew it all. I had some success so I was thinking inside the box. My way "worked", and therefore it was the "best" and only way of doing things. Anyone that would do something differently was just foolish and didn't understand what they were doing. Then I was served a healthy portion of crow. I still remember it. I believed we needed to add a fish to cycle a tank. Then someone asked, "Why is the fish needed?" I thought long and hard about it. I became angry and frustrated, mainly at myself, because I didn't have a good answer to the question. That's when I realized that maybe I didn't have the understanding I thought I did. Maybe I should keep a more open mind and start thinking outside the box a little. That's when I really started to learn.
Today, my system has very little in common with that old system. Because I've thought outside the box. I've listened to other hobbyists and their experiences. I've read many articles written for our hobby, and I've read countless research papers. I've also done a ridiculous amount of research/experimenting on my own. I've even swam the reefs of the Florida Keys for decades and watched the slow and steady demise. Countless times in this hobby, I've had to face the fact that someone else had a "better" way of doing things, or that maybe I didn't quite understand things as well as I thought. This has led to a system that has changed and evolved over the years as my understanding changed and evolved. This is only possible by thinking outside the box. If I was still thinking inside the box, I'd still be running that old UG filter and 6' tall PVC skimmer.
I never put anything through QT back in the day. I've lost lots of critters because of it too. Today I quarantine EVERYTHING before it goes into my systems. Not because I believe my fish or livestock have some immune deficiency, but because I understand that there are some diseases and parasites that even the healthiest of animals can't defend themselves against, in the confines of our tiny glass boxes. The last time I did not QT taught me this hard lesson. I had a clownfish system, with multiple healthy, well fed, spawning pairs. Some I had for well over a decade. I purchased a retired pair of breeder clowns from one of the biggest breeders in the country. (I won't call them out) They placed the fish in a bag, and they went from that bag to my system. I thought, surely they should be clean. They should have never even come into contact with a wild diseased fish. Within one week of placing those fish into my system, every one of my clowns were dead. They brought brooklynella into my system. I had fish die while they were trying to care for their eggs. It wasn't that they were weak, stressed, or had some immune deficiency. The relatively small water volume, and abundance of host fish, enabled the parasite to reproduce prolifically, overwhelming every fish in the system. There is no amount of probiotics, or live food, that would have saved those fish. QT may, or may not, have saved the fish I purchased, but it surely would have saved the rest of my fish.
Peace
EC