Hi TG,
It's true that a large percentage of people who have herpes don't get visible symptoms -- the numbers vary depending on what you're measuring and who you ask. So 30% sounds reasonably accurate from what I've read.
HOWEVER just because someone doesn't get symptoms doesn't mean they're never contagious. You can shed the virus in between obvious OBs (called asymptomatic viral shedding) and be just as contagious as someone who has a blister.
This is the tricky part of having herpes because there's no way to know for sure if you are or aren't shedding asymptomatically. The amount of time varies per person but averages to anywhere from 2-5% of the time, from what I've been able to read about it. In one study it was as high as 50% though, although that's rare.
I'm not trying to scare you or discourage you, but to clear up what sound like some misconceptions about the lack of symptoms.
To another question, yes it's possible to get OBs back to back like that. I've had them like that (just different anatomy

)
As for alternative treatments like red marine algea, I don't know if anyone knows for sure how or why they work, and they seem to work for some but not for others. I wouldn't go on the assumption that herbs or supplements are reducing your viral shedding though, the way Valtrex has been proven to do in recent research. It might but there are no studies to show if it does or not. Most alternative remedies work by boosting the immune system, I suspect, but I'm guessing.
Hope that helps!
TheOneInFour