If you have had several dead fish are there any steps that should be taken to renew the tank before adding new specimens- assuming good live rock, water parameters in line- ? large water change? and how long should I wait before adding new fish?
Once you experiance losses and do not know if you have resolved the problem, IMO you should wait at least 3 months with no losses of any kind before adding any new animals and then very slowly while maintaining excellent water quality.