Hey everyone I'm in need of some help. I've had ten deaths in the past week with absolutely no signs on the corpses or any symptoms on the live fish - until today. I noticed that one of my harlequins looks like he may have the gold sheen of velvet, but I'm not certain. He also has cloudy eyes which appear slightly popped out. Not even one other fish has any symptoms of anything. I haven't seen any flashing occur and everyone is eating well. Any advice on what's going on would be greatly appreciated. Tank is a 29 gallon. Sits at 25.8 degrees (has been up to 26.7 the past week due to a heat wave). I run two AquaClear 50s and one 70 as my tank is over stocked but I do 8G water changes every 3-4 days and it is very heavily planted. Ammonia and Nitrite are 0, in the middle of a water change right now so not 100% certain what nitrates are at.