More thanks everyone. Mrs Twig, that is the highest compliment anyone can give...that of wanting to emulate what you have created. This tank has been through many, many changes! I started with LOTS of GSP and softies. Moved to monti caps and digitatas. Took out the stinging anemones and euphyllias, and alot of the toxic mushrooms and leathers...and finally advanced to harder to keep sps and touchy LPS. The montis, and most everything in this tank started as a small frag. I had an orange cap get so big in this tank, it almost did'nt fit out of the top of the tank! I attribute my success to various things... making sure my TDS is 0 on my RO/DI, frequent water changes, dosing and top-off daily, LOTS of flow, and good healthy specimens to begin with. I also feed my corals. Another thing I do is since a little sand is often taken out with each water change, I replace it with new batches of live sand from the Keys, several times a year. I believe this gives the substrate an extra boost of micro-organisms.I think they are one of the most important components of a healthy tank. It's why alot of people who use only dead sand and mostly base rock often have problems. Their tanks are basicly dead. As far as coral placement and close proximity, it is something you have to watch very closely. a coral may seem out of reach of another, but maybe a nice big water change makes them expand greater one day..and ZAP...they sting each other. Or they may have very fine but long sweepers that you do not notice, since they only come out at night. Some corals on the other hand, learn to tolerate each other. The purple rim cap in the center, and the torquoise stag next to it...are growing together! Another few things to remember about corals....many of what we try to keep together in one system would never encounter each other in the wild, as they are all from different regions. When a new coral is placed in the tank, others often react with chemical warfare. Look up Allelopathy to further understand.