OK well i like to cycle tanks with fish. So they my platys are going throught a cycle. I had to take them out of my bettas tank because he wouldn't stop attacking my platys. So for the day i kept them in jugs. Well in that day 2 of them died in 1 jug. I think one was diseased, and gave it to the other one because one of them i think had a spinal injury. OK well i went out and bought a 10 gallon and heater and filter. Well i like i said i cycle with fish. So There are only 3 in there and Memo (the littles one dies.) Then my black and orange one is sick and dying. I have have Swirl the Black and orange one in a .5 and keeping the heat up. Also my filter seems to be broken cuz it makes this REALLY lound noise and keeps the water green and murky.... But my biggest one ribs i fine. He is playing and blowing bubbles. But I am getting a test kit some time this week.