I'm going with pet peeves in the hobby and MFK lol they go hand in hand.
I have a few lol
#1 The Tattooing of fish, and the breeding of short bodied fish or any kind of deformation.
#2 The way a lot of people SWEAR like the know what they're talking about on this forum, they go around giving people advice when they don't need it.
#3 The over pricing of stingrays in the hobby.... "A+++++++++++++++++++ BD's you can buy pair for the cheap price of $6,000 @ 6 inches" Okay in what world do you live in and I think its time to stop inbreeding your fish... and where is this grading scale, because I have yet to see one....
#4 People who are rude and are quick to tell you that you're wrong, what you're doing is wrong, and this "you seem like you're very inexperienced... blah blah blah" where is your degree that makes you and expert? Wait you don't have one... thats what I thought.
but I got mad love for everyone here so I'm not hating on anyone. I wouldn't be where I'm at today in fish keeping without MFK and the people that helped me get to where I am now.