So about 2 weeks ago after the 5 gallon was cycled, I finally start putting in my miyavI in it. Now his fins are spiky a little bit and now has fin rot on his tail. I just did a water change today and another one yesterday. Can someone help me? He still looks the same like he was several months ago(pale and lethargic) when it occurred. Now he looks worse than ever. It is very heartbreaking seeing him like this and I don't want to end up putting him to sleep because he looks so ill.