so i bought this diamond goby about 2 weeks ago and put it in my 90g and everyday id see the sand has been moved around a bunch as i expected and id seem him scooting around the sand, but recently i haven’t noticed the sand being disturbed by anything and haven’t seen the goby in a little while not even his head popping out from anywhere i have peaceful fish in the tank so i dont think thats the problem ive been testing parameters frequently and everything has been perfectly fine, did it die or am i doing something wrong