My (ex) girlfriend is studying in the UK now, and she's given me her fish to take care of... The problem is, it lies on the bottom of its tank all the time, and my dad from his experience with fish tells me it looks sick... I asked her about it, and she says it's always done that, but I think this isn't good. It seems lethargic as well.
Are there any particular conditions that cause this? I believe she has been using tap water, and since we live in an urban area, I think the water contains sodium ions.
Also, I would appreciate any tips I can get, in terms of keeping it healthy and happy. The kind of water to use, how to treat it, the environment to keep it in... anything will be appreciated.
Thank you for taking your time to read this.