According to the original post, the original author made adult petras 5 cm tall, if I’m reading it correctly.
That’s both good and bad;
- Bad as if something that small can cover 9 miles distance in a hour; that’s amazingly quick.
- Good in that that virtually any level of water could drown them - if a normal fluffy can drown in a inch of water, these drown in millilitres (a quick go over with a sprinkler hose would be sufficient or moderate to heavy rain).
- Good as all you need to stop a home invasion are glue traps
Looking at the rest of the list, they’re just harder to kill microfluffies, like cockroach hard to kill.