So I posted about a guppy not eating a few days ago. Now he’s not only fasting but very listless. He’s mainly swimming still in a corner or hiding on the gravel in the cave. He doesn’t really react to anything, not to the other fish and he doesn’t even pay attention when I put my hand up to the corner he is swimming in. Should I quarantine him? I have a small travel tank a heater and an air pump and tomorrow my back up filter will be arriving, Will this work for a quarantine tank for a guppy?