Hi. I want to ask. I just recently bought a 5 cm rainbow shark yesterday. I put him in my temporary 20 gal tank that already have 2,5 - 3 cm black tetra, which there are 3 of them and one leopard bush fish. I am not intending to add another fish since it is pretty much overstock i know. But he hasn't eat anything since yesterday and tomorrow i am gonna have a weekly 25 oercent water change. Is it gonna be okay? And is it okay for him to not eating? As far as i am aware, no sign of white spot, tick, or whatsoever in his scale. Thanks