Yes they are visible, more so after you get used to seeing them.
I just finished the 3rd and last week of Interceptor treatments.
Quarantine everything always. I will be from this point forward. I had a pod population in the affected tank that supported both a fat and happy mandarin and a fat and happy sixline. They will be living in another tank for an indefinite period of time as all of the pods are dead as well.
It depends on who I get the frags from whetherI quarantine. Some people I REALLY trust I dont' most of the time I soak the the new frags in interceptor for 6 hours with a heater and a pump. Any red bugs would die with that.