Harry i don't know what to say ,i have not seen any thing like this before ,it is a bit like a man living with a bear in the same house ,not only the flowerhorn but the jewelry and various glass decoration and statues ,you are definitely different but in a weird way i like your tank . As how long your discus are safe ,well it depends on how stressed they are ,if it was me i would start to look for another tank for them tomorrow .Only my thoughts .