Showerhead orange slime buildup

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After using brand new shower for about couple weeks I noticed the showerhead had a tendency to have poor water pressure at the beginning of a shower session.
Couple more weeks, I noticed orange/yellow looking goo coming out of the rubber spray holes on the showerhead. The thing was hanging couple millimeters out, I picked it out with my finger to inspect closer, it appeared to be orange, almost like a jelly, but much much softer.
Barely 2 months in total the pressure dropped dramatically. Will be dismantling and cleaning it up today.

I've read about bio-slime building up in showerheads or calc/rust, but I have never seen these things to make a conclusion on what I'm dealing with

The shower system is technically new, along with water system and the building itself. Building is not even year old. I live in a apartment on 10th (top) floor. Water is pumped from lower levels, and no built-in boilers.
Anyone dealt with this nastie before? Concerned it might be a bacterial trouble, or is it just some residue from new system?