The information you provided is invaluable. I actually was target feeding him this evening and he responded to four pieces of mysis and after I left his view, he proceeded to eat from the bowl with our other horse. We noticed that he is shy, but a very good hunter. He was the only one of our horses that actually went after the live shrimp and was really good at catching them. The recent horse that perished was the only one that had a problem with GBS….he had this problem two other times over a years span. I noticed that on one occasion we had run low in the sump and the protein skimmer was emmiting more micro bubbles than normal. This might have been the problem this past time. He tended to flush his pouch more often than the others.
I did just receive notification that the horses are on their way and my wife and I are confident that there is nothing wrong with the tank. We are testing the water tomorrow and will update you on our water parameters. They should arrive on Friday morning. We will keep you posted….thank you so much for your help. We are going to use this forum often and hopefully share some pics.
Ed & Jessica