Lucky enough to never wind up with a disease outbreak in that time.If the tank lasts another 50 years, will I still be considered lucky?
I have nothing but respect for a 50 year old system, something I hope I could achieve one day.
A closed system is not the ocean, however. If a fish infected with velvet comes in, when it drops the cysts off, they will grab right back on in the next free swimming stage. Same for ich. This is why you don’t see these diseases killing fish left and right in the ocean like they do in tanks. Same reason we would wear masks indoors but not outdoors.