My 3 koi platies have got a twisted body now for the last 2 weeks. I keep them in a sulwesi tank with a PH of 8.5. I used 4 of them to cycle the tank and 3 were fine for about 2 months. One died after a month but was not deformed and now another one just died. The 15 sulawesi shrimp in there are all fine. My ammonia levels are 0 as well. Any ideas what could be the cause?