First liquid culture. I've left it for 2 weeks and these spots formed on top. Are they new mycelium growing or contamination?

This is my first LC I used 3cc of it to inoculate some grain. Then it turned kinda brown. I've left it alone for about 2 weeks and these spots formed on top. Are they new mycelium growing or contamination?

Uploaded on Mar 31, 2025

Open full-size image [3024 x 4032 pixels] First liquid culture. I've left it for 2 weeks and these spots formed on top. Are they new mycelium growing or contamination?

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