I have had my tank for 5 years or more and everything has been fine recently we added an eel to our tank. I had been feeding him everyday for like 3 or 4 days. Soon after this time period i thought hmmm i wonder if theres any fish parts hanging out in his cave. I picked it up and sure enough fish heads came out. At the same time our star fish died. So needless to say we had an ammonia spike and i cant get it to fully go away. I have done many water changes tried a little bit of product to bring it down but i didnt want to over do it. Now my 5 year old puffer is sick and wont eat( and he loves to eat). Everything else is fine no nitrates ,nitrites and ph is good. What should I do and will my puffer make it?