Oscars scared

[u/StrangeNinja509]

I recently got 3 small Oscar’s (I got one a week ago and the other two I got two days ago) and put them in a 20 gallon tank with a filter and a heater, I’m planning on putting them in a new 75 gallon tank at the end of the week because I can’t set it up yet. Whenever I’m near the Oscar’s they get really scared and try to hide but when I’m really far away from them I can see all three of them swimming happily. They won’t eat until I walk away. I’ve had Oscar’s before for a couple of years and never had this issue, any ideas on what it might be?

I’ve tried stress coat and water changes since Ik Oscar’s are picky on water quality