My Betta is the only fish in a 21.6 litre tank. It's all cycled with mature media, tests show 0 for amonia and nitrite and it's cleaned every week. I noticed one tiny pin hole in his fins which got bigger then split. Last night I noticed another pin hole on his fins. I can't think why this is happening.
Any ideas on why it's happening?
Any ideas on why it's happening?
