When I went away, I put in live plants to feed the fish...they will nibble on it so they can eat...but i was gone too long, so the infection had already started...
It killed my two guppies within days, even though i had taken the plants out. The 2 mollies i had at the time were covered in leeches...so they both survived the whole ordeal, but i still want to help other people so it doesnt happen to them.