I have a question and this post is going to kinda be all over the place but please stay with me and try to help me out. By the way I am numbering the fish (#1- #6) by the order I got them so you can follow what I’m saying. I got a 8 gallon fish tank for my 4 year old that I set up a month ago and it has been a rough go. This is my first go at having an aquarium And Like I said I set the tank up a month ago and when I set the tank up, 3 days later I added our first 3 guppies (#1, #2 & #3). We did a fish in cycle as we were told that we could do per the pet store by using liquid starter Bactria. I used the bacteria as directed for a week after getting the first 3 fish and The day after we got our first 3 fish one died (#2). I waited a few days to replace the one that died but got another one (new #2) About a week later we added 2 more guppies (#4 & #5) and a few days after that we added the 2 ADF. So at this point we had 5 guppies and 2 ADF. Soon after that, one of the original 3 fish was not doing good (#3) so I took it back to the pet store and switched it out with one that looked just like it so that my son would not be sad again that another one either died or is sick so now we have a new (#3). A week later we added the final fish (#6) to make 6 guppies and 2 ADF. I woke up this morning and one of the frogs was dead and so was the last fish (#6) we got just a week and a half ago and the fish that we got to replace the one that died (new #2) is staying towards the bottom of the tank and not eating or doing good at all. The other 4 fish (#1, new #3, #4 & #5) and the other frog are doing great and I don’t get it. Why do some die and the others are doing great? During this last month my ammonia level has been between .25 ppm to 1.0 ppm. My Nitrites are 0.0 ppm and my Nitrates are at 5.0 ppm. My pH is 7.8 which I was told was a little high but okay. Because of the ammonia I am doing water changes every day or every other day until I have 0.0 ppm ammonia or until the tank fully cycles. I have added bacteria after I add a new fish and after each water change. I use Prime as my conditioner and to control the ammonia. A couple of my fish, not all had stringy poop which I think was constipation. I thought they could be parasites but all my fish would have parasites not just a couple. If the ammonia was to high all the fish would be sick not just the ones that died or is sick. So do you think it may be just bad fish from the store? Like I said, if it was parasites or a ammonia problem all the fish would be dead or sick or am I wrong. Please help. I don’t understand why some are doing so well and others are dying.