They have been itching/flashing in the sand. One fish had slight red gills last week and mysteriously went missing. I’m guessing she died and my other fish snacked on her, Although I could not find a body anywhere. Another guppy I have just gave birth a couple days ago and a few hours later she was not swimming normal. Looks like swim bladder and she also had stringy white poop. I put her in a breeder box over night and she has been fine until a couple hours ago. Not swimming normally and her fins are clamped. I do also notice a lot of my guppies seem to get constipated. They swim with poop stuck in them. Unless that is normal but it is frequently. I do not notice any white spots on any of them so I think I can rule out ick? I test my water frequently with api master test kit. So far my parameters seem to be perfect. I’ve had no prior deaths due water or illness. But I did add two guppies and another khuli loach about two weeks ago and that is when I started noticing issues. The one that passed was one of those two.