I had two fish so far pass and I’m just not sure why the Parameters are Ammonia: 0 Nitrate: 40 Nitrite: 0 And my tank is cycled, it’s just my guppies are dying off slowly. I have noticed that the ones that have died had slightly ripped tails. Could this be an infection or from fighting? Here are some pictures of them. There is absolutely nothing else wrong with the other fish it’s just the guppies, but there could be a problem in the future so if I see something arise I will update you I just need help ASAP!