Glo fish die. Ammonia is 0.25. Should I do a 25 percent WC. I already had 3 guppies die on me, that was a while ago. I used ammonia blocker as well. What kind of wc should I do? Why do my fish keep dying on me? My ammonia was 0 but not today. My Ph is high. can I buy something to lower the ph levels in my tank?