All the water test come back safe. Tank is at 80 degrees. Tank has been setup for 3 months. Fish is eating fine and swimming around normal. Filter is a pinguin 330 . Tank has slight green water... overnight the mark got bigger and one devoloped on its head between the eyes and now there is a few black spots on the fin on top. The. Fish is about 4-5" and is a few years old. My other red zebra and giraffe hap are still fine so far