Possible infected starter?

Hey guys,
I am looking to brew a bavarian hefe soon and started bring my yeast starter up from a slant of wlp 300. This is my first time using this yeast and first time cultureing up a hefe yeast. The starter was cultured from 10ml to 100ml to 1000ml. So this morning I took a sample from the starter to taste to make sure everything was good and the sample has a slight tartness to it. Not smack you in the face tart but also Im not getting any banana or clove taste. The starter wort was all extra light dme so I dont think there is any wheat in it. So has anybody ever worked with this yeast enough to know if that is a normal flavor? And is it possible that its from the non wheat base wort? Thanks in advance.

What do you mean by tart? Green Apple?

What was your starter temp? High 70's?

Starter wort never tastes good in my experience...

It wasnt acidic tart but just seemed to have a slight sourness to it. I think my starter temp was somewhere around 70 degrees. I ended up stepping it up to a full liter starter and it worked fine. I think it was just the taste of the hefe yeast that seemed to give it the tartness. The beer fermented out fine and tasted great so I guess I just was a little paranoid.