Tank crashing...could it be due to these?

[Aquattro]

It looks like Julian has kept his research "secret", because I couldn't find it. Eric Borneman actually did an article refuting Julian's claims, but some people found that it did slow/stop RTN in acros.
As for size, no, I don't see any correlation to flow. I have always adjusted flow to compensate for growth, and this STN affects frags just as often as colonies in my tank. Also, my birdsnest is getting to be the size of a soccer ball, and does not show any tissue loss.
My pH is fairly constant over 24hrs. never going below 7.9. My reactor discharges into a high flow area right above the skimmer intake, so CO2 doesn't seem to have negative effects. However, I have turned the reactor down anyway, in an effort to reduce alkalinity. I have about 7000GPH of flow in a 150g tank, and the surface agitation keeps the gas exchange movin'!
The only other info I've found to explain this tissue loss is PO4 accumulation. I agree with you about PO4 cycles, but I don't have any better ideas to follow. And I certainly didn't see the harm in adding a PO4 sponge to remove my invisible phosphates! The trouble with my entire procedure is that in a desparate attempt to save my corals, I make multiple changes over a week. If/when this all stops, I won't know which change/combo eliminated the problem.
I gave someone a bunch a frags as insurance, and they are all doing well in his (newer) tank. So what does that indicate? Nothing maybe, but it does seemto be something in my water, whether chemical, biological or physical.