The clown I have had for about a year. he eats really well. Funny story regarding the clown, I had wanted one for a long time and was at the LFS when a delayed shipment arrived. It was over 24hrs in shipping (probably more like 36). As they opened the boxes it was clear there was many DOAs. Well, they pull out a bag with this tang in it....and he swimming around not looking stressed at all. The owner of the LFS knew I wanted one, but thought this one would also die, so she said take it...half normal price, if it does die, ill replace it.
It went into a quarantine tank, no lights, lots of PVC pipe to hide in. Stayed there for 3 weks while I trained it to eat stuff besides nori. Then into my main tank.
It has done fine ever since. Hes definitely growing.
I think the main issue is not keeping them alive, but getting them healthy.
Paul.