Hi I wondered if anyone could help, I had three goldfish that I won at a fair (shocking I know!) Two of the fish were being kept in a tiny bowl crammed with other goldfish and the other was in a bowl alone. We bought a huge tank for them however the one that had been alone kept attacking the other two chasing them and bumping into them which was causing damage and making them poorly so they had to be moved and a friend has had them for about 6 months now and the one with us has a 150ltr tank to himself. Recently however he has been acting strange and is more active than usual and gets excited and irratic when I go near his tank, today he has been jumping up out of his water which he has never done before. I have had the water checked and it is fine and as soon as I put his light on and gave him some attention he immediately calmed down. I think he is bored or lonely however after how he was with the smaller goldfish wondered whether there is another fish he may get on with or whether it may help to get a fish bigger then himself? Any advice would be appreciated thanks ☺