All valid points.... good to have the conversation with you all than just talking to myself

The tank is doing fine (assuming that I don't overdose my alk again); just trying to make some improvements. Some ideas are more pondering than anything. Somewhere in my mind I think the ideal tank is one that is undrilled and unsumped, getting all its from from Tunze/Vortech. Not really likely, but I can dream

This tank overall is pretty quiet, but I really feel the vibration when I hold the PVC on the return; it could be bothering the fish and coral. I think some soft plumbing will help. The Iwaki is very quiet too, but maybe something like an Eheim 1262 will be better to reduce vibration. I still think my polyp extension should be better -- could the interior vibration be the cause?

I have moved the returns a bit to help with the water flow; we'll see what happens with that. I think the tank returns were fighting directly with the stream of the big Tunze.

Thought that maybe a bigger skimmer would be a worthwile exercise, but my Nitrates are very low, generally below 5 ppm.