I have a neon blue DG in a 20 gallon with 5 bloodfin tetra, 1 molly, 8 harlequin rasbora, and 1 guppy. I’ve had the DG for about 2 months now, and he never does anything. He just swims in the same spot and hardly ever swims side to side, up and down, etc. When I feed, he has always passively let the other fish eat and then ate what was left. He seems to avoid the other fish and stay to himself. My tank is cycled, and, even though I had a random ammonia spike a week ago, he was acting the same when all parameters were zeroed out. Do they always act unsocial and disinterested in everything?