How bout the nori? could it be treated with something? soy? salt? preservatives?

The two kinds of nori are, your standard green from BAs and the Julian Sprung red nori.

Has there ever been an issue with these foods before.

Thank you Bev for the readings. I'll take a look at the readings next chance I get.

At night your Corals and algeas produce CO2 and use up O2 from I respiration (I think that is what its called). This is when they convert sugar to ATP I think....

If it is and o2 problem at night wouldn't it effect the larger fish first for them using more air. My parents pond froze one winter when the pump died, so with no gas exchange all the fish died except one...The smallest. just a thought

The problem is either one that has built up over time and is just now catching up to your livestock, or one that has been recently introduced.

If the problem is one that has built up over time, I can think of poor tank maintenance, dirty (and not performing optimally) skimmer and/or powerheads, chemistry out of whack. That said, I would suspect if it was poor tank maintenance, both fish and corals would be suffering, but it's something else to look at.

Any new additions to the tank lately, either fish, corals, LR, sandbed, new food, or anything else that could have introduced disease or parasites?

If the problem is parasitic isopods, my understanding is that some species burrow right into the fish and may not be obvious when examining the dead fish other than an initial hole and a deflated area under the skin where the isopod has eaten the fish. One article says isopods are most active an hour or two just after lights out and before lights on. These times, especially after lights out, would be a good time to look at your fish using the red light as described in one of the links. If the problem is other types of parasites, I would imagine the same methods of looking for them would also apply.

BTW, any new fish deaths over the last day or so?

Do you have any soft corals that could be battling with neighbors? They can produce toxins that will kill fish when stressed.

strange disease
 

Hey,

May or may not be a fish disease, could be water or air contaminants that somehow entered the tank. I would do a series of water changes over a few days and clean / inspect all filters, pumps, and sumps. I would also run extra carbon and ozone if you have it. If you have UV, I would get that going also.

Very true Bill, I too would start agressive water changes, run carbon, and clean all filters and replace all sponges and other media you can.

We've been doing water changes every other day since the deaths occured. We've been running fresh carbon since the issue began.

Bev,

There has been no deaths lately.

As for seing any damage to the corpses I haven't seen anything that would indicate laserations, dermal damage, or cellular decay.

We have been looking each evening since you posted those links for the isopods

I still think its connected to the foxface in some way. Anywhere that anyone can think where I could research more on foxface posion. I did search ReefCentral once, but I can't stay up that late anymore. I've searched via google, and a few other databases.

Catherine maybe try reef frontiers. They are pretty good at narrowing down problems. Anthony Calfo is on that board along with Mojoreef and both are pretty good at narrowing down things to try. Worth a shot anyway.