3 days is also not unusal for new fish not to eat. Add the garlic to some frozen stuff too. It might eat better if food floats by instead of having to come completely out of hiding to eat.
It is a very wimpy fish IME. Gets scared and shows that ugly yellow and brown splotched color.
BTW - 37g is small for that fish. What else is in the tank with it?
"Life may not be the party we hoped for but while we are here we might as well dance!"