My aro was healthy and was eating his food regularly but he suddenly stopped eating 4 days ago and he sometimes stay's still for a long period of time without moving at the top of the tank (he occasionally moves but not as much as he used to before he stopped eating), and also I found this in his tank (image 2). Please help me know what's wrong with my arowana.
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![1000333284.jpg 1000333284.jpg](https://www.aquariacentral.com/forums/data/attachments/188/188968-99c5afba85bb66404ba4e0213d66517b.jpg)
![1000333339.jpg 1000333339.jpg](https://www.aquariacentral.com/forums/data/attachments/188/188969-58e4fdbab37b64a20d6c99f970b7d9b5.jpg)