Okay well I can buy him some stress coat then.
And yeah, the spot on his head is like a white sort of fleshy color, and also I noticed the color on his sides are a bit lighter, and under one of his pectoral fins. So I read the reviews on a heater and it said that for a 6 gallon tank the temp. was up to like, 76 degrees. Well Venus is only in a 3 gallon, so I'm worried that it might over heat the water, especially since the tank is only half full right now. And Venus has never had a heater and is probably rather used to room temperature or below, so it might be a little freaky for him... so does anyone know of one for a smaller tank?