No problem! I've been in the same boat as you. Tank parasites are never easy, and it takes a while to get a good idea about each one. Thankfully, R2R has all the answers, and we're always here to help! That's how I learned these things, through time and experience, and the help of this forum.
I think a FW dip might help confirm if they're flukes or not. If nothing comes off, then I may begin to fear some more difficult and deadly parasites like velvet or brooklynella. However, seeing that you got the fish on Saturday, that would be strange, as those two parasites are fast acting.
Just as im prepping the freshwater dip I go to look where he is when all of a sudden the back of his fin is gone! Should I proceed with the dip I dont know what to do im in panick mode!