So I keep a 36 gallon guppy tank for my girlfriend and the other day I came home to 6 new guppies. Now I warned her not to add too many at once but apparently she didn't listen. So I've been doing water changes every day to keep the ammonia down untill the bacteria can catch back up. However they keep dying off. Now there is no way my water qualities are off since I'm doing a water change each day with prime. However today I noticed a lone white round worm squirming in the water of the tank. Super small, could this be it? Could the new guppies have had a parasite from the petstore? Anyone ever had this problem? How did you treat?