I just came back from a customer that has a huge 28" koi with bulging eyes in a pond app. 8' deep....great pond inside their living room....super filtration...great people...we are thinking about moving this koi into a 4' pond to see if the bulging eyes go down then back to normal...has anyone ever had this happen and tryed what we will be doing? I'm told this will work. This isn't any disease...we'll let you know what happens.