Originally Posted by
Fishquake
The issue is is that no matter how long you quarantine German sourced discus, if you eventually put them into an aquarium that houses Asian sourced Discus the potential for diseases that the Asian Discus are in all likelihood carriers of though which they have developed an immunity. Introducing fish without such immunity, even after they have been quarantined for weeks or months will still result in sick fish. I'm not saying this is the case for everyone, perhaps its a matter of which Asian sourced Discus you already keep.