There is a monogenetic trematode ( Neobenedenia ) that is pretty common and often goes unnoticed/misdiagnosed. The reason being is that it is clear and very difficult to see on the fish and the problems it causes are symptomatic of many other problems. Some of the symptoms are cloudy/swollen eyes,frayed fins,blotchy/pale coloration,and red ulcers/lesions. One of the common names is the Eye Fluke. A freshwater dip will tell you if they are present. You should see them coming off the fish at around the 10 minute mark. The FW will turn them a frosted white in color and the will be oval. You need to do the dip in something that you can easily see inside because if the are small they can be easily overlooked. I've found that Prazipro by Hikari is the best fix for them though you can use organophosphate(Fluke Tabs by Aquarium Products) or formaldehyde/Adlehyde(Paragaurd by Seachem) based treatments as well.
FW and all the above mentioned treatments will have no impact towards the eggs. Bleaching the system will not either (alcohol will but I don't see that is being practical in most cases.) Because of this a treatment protocol will need to be established that will allow enough exposure to ensure that any hatchlings are killed as well.
Make sure that before using and medications that your UV and ozone units are turned off until the treatment is over and the compounds have been removed. These devices can render many medication ineffective and some lethal.