Hmmm...
The new sump system was circulating newly mixed SW made from RO/DI for several days before I hooked it in. Send and return. Nothing was showing up on tests, no ammonia, nitrate, nitrite, or phosphate detectable, so I felt safe to hook it up. Balanced the PH, salinity and temperature to match the display and went to it.
The rock was in 7.0+ phosphates near as I can tell for months. I replaced all the sand. I've taken a few small rocks with softies out over the past month and put them in my nano. I get a phosphate spike for about a week each time...up to 0.1 before it drops back below 0.03. I'm betting the phosphates are in the rocks.
The TS has really kicked in. It was an inch thick when cleaned last Friday and looks like it will be again this week. The bulbs are 2 months old. Two 23 watt and two 26 watt. All 2700K. I moved it to the big sump on Sunday. Easier to watch it grow and A LOT easier to get at for cleaning.
Overall, I'd say it went well. Had a good amount of cyano going before the big water change. Just did a survey and can find almost none left. Seems to have turned to greyish sludge in a few places, in others it's just gone. Fish, anemonies, softies, shrimp, snails, etc. all seem happy. The shrimp are noticeably more active. All of a sudden they've come out in the open.