Help is this ICH or normal?

[Newbie-ishfish]

Hi I normally have cared for red wag platys but ordered some variety for the first time so I’m not sure if this is normal color variations or if it’s something wrong like ich? I noticed the color on two different tails of my new platys.
To my knowledge they were not there when I got them a few days ago but it’s been a hectic week here. 

parameters are great- 0 ammonia 0 nitrites <20 nitrates 7.5ph temp is 76 degrees 

 

fish behavior is normal, eating normal. No other signs that something is wrong. 
 

if it is ich what’s the best option out there?!

[Colu]

That doesn't look like ich I could be the start of epistylis that feeds off gram negative bacteria on the slime coat of your fish and spreads more quickly at higher temperatures the most effective treatment is to dose the tank with malachite green active ingredient in ick X and do a course of maracyn2 in food feeding a small amount twice a day for 7 days