I've noticed that my new Flame Dwarf Gourami is acting somewhat strangely. Whenever the passes by a plant or a rock, he will flash against it, despite having no visible white spots. He also occasionally jerks his head in a way that resembles a spasm. He is currently alone in a 20 gallon tank. Admittedly the Nitrates are a bit high at 20, but I'm not sure if it would be a good idea to do a water change while he is getting used to the tank.