Here is an update.
I did lose my black and white clown. He always ate like a horse but didn't grow and started to quickly get very thin and died before I had a chance to do anything. I got another clown to pair with my remaining one and they got on great from the start. That was a few weeks ago.
Yesterday I had to return one of my hermit crabs. He was an electric blue hermit which I now know is one of the most aggressive types. I am sure he killed the other hermit crab I bought at the same time that was similar in size, that was on day one. This week I picked up a few astrea snails and a conch. I caught the hermit crab wrestling an astrea snail on the first night so that was the final straw. He was returned to my LFS yesterday. I even got a tub of marine pellets in exchange which was good of him.
I have added another 2 zoa frags. Best are the radioactive dragon eyes which are a great colour. I also got a type of fire and ice zoa, but they have not been as colourful as I hoped. Early days maybe. Finally I got a small neon candy cane frag.
I am having a problem with diatoms which seem to be slowly improving. They are still forming on the sand everyday but not so much on the rock. The new snails and conch should help.
I also had phosphates drop to zero which has been fixed by feeding Reef Roids to the corals. Nitrates are present but also low. I think the diatoms feed on those making them lower. Also the bio load on the tank is pretty low with just 2 small clowns and a small royal gramma. The royal gramma is so territorial that I might not be able to add a fourth fish now though, but will see how it goes.
Here is, the now standard for me, poor quality photo. When the diatoms go I will attempt some better ones ...