Brandon suggested I post my story here. I just spend the day doing a complete teardown on a 2+ year old 36 gallon bowfront and replacing the crushed coral with live sand and rescaping. I took a lot of pictures. I think I will just include thumbnails to keep from making this too, too long.
Before
I was having a lot of problems with cyano, diatoms, and vermetid snails. I don't over feed. In fact, I am very stingy with my feeding (2x a week). Nitrates still 40-50. Detritus in the substrate.
First step was to prep and plan. I wanted to keep a lot of the water because I don't have a RODI unit and that would have been a lot of trips back to the fish store. I had several buckets, and 10 gallons of new salt, so I planned on about a 30% water change.
Sterilite tub with a heater and small powerhead. I kept the powerhead right at the water's surface so it could increase oxygenation. I siphoned water from the top of the tank in here for fish, cuc, and any rocks with corals growing on them.
The live rock with no polyps. The large fan coral and the blue coral were both collected by my father back in the 60's when he was in the Air Force on Johnston Island. They were in his closet for 40 years. I have had them in my sump curing for a couple of months. They will be part of the new scape.
Did I mention how much I hate vermetid snails? With the white hot intensity of ten thousand suns.
Corals and fish and Kraken, my rather large banded serpent star. He was a lot smaller when I got him.
Since I needed to save a lot of water, I didn't want to stir up detritus into the water I was keeping. I left one rock in the tank to put the siphon against as a bit of a barrier.
Scooped a lot of the coral with part of a failed fish trap I made a few months ago. Then it was shop vac time. I even used the crevice tool. Then I got a little bit of water and rinsed the sides and bottom and shop vac'ed again.
OK, here, the pictures stop because time was a bit of a problem. My wife decided to paint a spot behind my tank that has been bothering her, and I was trying to decide how I was going to rescape. The plastic tub with the fish and coral was starting to have some slime buildup from the corals. The frogspawn put sweepers out, so I stopped taking pictures and just put the thing back together
I used CaribSea live sand for the first time and I loved it. No cloudiness. I put in 40 lbs. Then I used some reef putty and kinda played around with the rock. Since I knew some of my coral rock would need to be used, I filled the tank and scaped in stages. I put a few inches in and then created the base. I worked above the water line with live rock until I wanted to use a piece that had corals (blastos, Cyphastrea, and GSP mostly) and then I would add more water. I ended up being about 3 gallons off in my calculations. Some of that water, I just couldn't pour back in, so I made a quick trip to my LFS. Here are a few shots of the finished product. The only casualty was my Hollywood Stunner, which I grew from a tiny 5 polyp frag. I was hoping to make it a centerpiece. Now, I guess I have two. I was upset at first, but they are fast growing.
Thanks for reading. If you see any corals out of place, or next to a neighbor they shouldn't be, please let me know. I am thinking about getting some sort of encrusting coral to start growing on the fan. Suggestions welcome. It is currently until my overflow box, so lighting might be an issue there.