We have two in-wall 120s that are more than "seasoned"....probably a good 15 years old. There is no outward signs of distress of any coral in the tank. However, we have been having problems with fish. Presently, there is a yellow tang and a long nose hawk that are in the left tank and a sailfin tang and a purple tang in the right tank. A few months ago, we tried adding other fish. The current inhabitants did not attack the fish and all seemed well. They were eating and looked fine. However, they started dying off within about a week. They'd go from eating one night to dead or dying the next morning. We thought it might be that they were poisoned when caught, but they came from different locations.
Forward to a month or so ago when we added a few more fish to just the left tank. There was an algae blenny, a cleaner wrasse, a kole tang and a hippo tang. All were eating well. They lasted for about three weeks until they all started suffering the same fate.
In both of these cases, the original fish seemed fine. Some of those that died had some ich at the time of their death, but certainly not enough to kill them.
Today my purple tang is dying. He was one of the original inhabitants and the last "new fish" to die probably has been dead for about a week. Nothing new has been added.
Any ideas what could be the possible cause? I'm leaning towards something that is still in the tank since the two groups of fish came from different stores and were caught from different locations. If it is parasitic, it's not obvious what it is and it is a killer that has them going from feeding to dead in less than a day.
Forward to a month or so ago when we added a few more fish to just the left tank. There was an algae blenny, a cleaner wrasse, a kole tang and a hippo tang. All were eating well. They lasted for about three weeks until they all started suffering the same fate.
In both of these cases, the original fish seemed fine. Some of those that died had some ich at the time of their death, but certainly not enough to kill them.
Today my purple tang is dying. He was one of the original inhabitants and the last "new fish" to die probably has been dead for about a week. Nothing new has been added.
Any ideas what could be the possible cause? I'm leaning towards something that is still in the tank since the two groups of fish came from different stores and were caught from different locations. If it is parasitic, it's not obvious what it is and it is a killer that has them going from feeding to dead in less than a day.
