One week and five days ago I rescued a goldfish from an Iranian new year ceremony - they were going to flush it down the toilet and were keeping it in a cereal bowl. I had never kept a fish before and this was an emergency so placed it in a brand new tank (15 ltrs) and then six days later put it in a 60 litre tank with filter, pond weed and two pet shop bought decorations and gravel. I did not know about cycling or ammonia at the point that I got him from this woman's house, I just couldn't bear to see a fish in such a tiny bowl. The fish then developed white spot so I am treating with interpet anti white spot (dose no. 2 is tomorrow morning) but I have just noticed that there is a split in his tail. It doesn't look inflamed or opaque ( I googled tail problems and fin rot!) but I am very worried as I have never kept fish at all before, I don't know where he came from or what normal fish behaviour is but I have become very very attached to him. If anyone can help me or give me advice I would be oh so grateful - I know I should have done more research before getting a fish but obvioulsy there was no time and I acted in the best way I knew how. Please please help.....