Lucidkaos

Hi, this is our first beta and when we got him his body was all dark with just a small white patch on the top of his head, but after 3 weeks it’s now covering his right side and just a little on the left. Other than this he seems happy and active He is in a planted 10gallon tank & the water parameters: PH between 6 & 7 (I’m having a hard time matching the colors) ammonia, nitrates are all zero. Temp is 78 degrees. Here are some pictures, is my beta sick?