This is heartbreaking. I have a 24 Nano tank with 2 baby seahorses. Last couple of days the water get really cloudy but the water parameter is all good. No ammonia, no nitrite. The only thing I can think of is that when I did the water change, my husband made a media reactor bag which is filled with searched phosbanf and some activated carbon. Yesterday I went out, my husband decided to make a online nano reactor. I attached a picture. He put carbon and phosband iN it. I came home, the water is so cloudy and dark and both seahorses were dead. He didn't think he did anything wrong. I am looking for answers