I've had some ghost shrimp in my tank for over a month, but the past week or so they've been dying off. They start to grow white and less transparent, and have a light brown colouring on them. I've been doing water changes weekly and am going to bring a water sample to be tested to my lfs tomorrow (tomorrow I'm due for a water change as well). Any ideas why this is happening? My betta, otto and adf all seem healthy. I only have one ghost shrimp left from 5! Maybe starvation since I target feed the ADF and betta, but I even target fed the shrimp once and a while with frozen blood worms. 