TheTodd
Aquarium Advice Addict
You have parasites on your tank. You have to wait for 6 weeks before adding a new fish in your tank.
What makes you come to that conclusion?
I agree that something odd is going on, but if water parameters were off, I would think that all those corals would be in bad shape. It sounds like surface agitation is ok, so that's off the list.
How are you acclimating your fish when you get them? Maybe its something like that, but I would think they would die sooner.
Are there any visible signs of anything going on before they die? Are they eating? Swimming around normally? Scraping against rocks? Heavy breathing? Visible spots?
Do you have any fish in there now? If not, I do agree with leaving the tank fallow. If it is Ich or some other parasite, 6 weeks is good. Marine Velvet is 8 weeks. I'm not thinking MV just because that generally hits hard and very fast. It is tough to see sometimes.