my betta has a small dot right above his eyes. at first i thought it was white (fungus) but after lookin at it more I think it looks more like a small piece of glass. it just appeared today. he had something similar on a different body part when i bought him and that went away on its own. i dont know what this is and i dont know if i should take action. he's in a community tank so i only want to medicate if its really necessary. any thoughts?