Spot on my clown fish.

[pcavazos76]

Hello I'm new to the hobby, I started a 30 gallon long saltwater tank. I'm running an Aquaclear 110 two 425 nano power heads with a heater. The tank has been running for one month and a half all my levels are good nitrate is at 10.
I'm wondering if this is a parasite? It kind of looks purple.