Startup Stonescapes Mini Pebble Pool

I m on day 2 of the pool filling with water and I got this big spot in the deep end. The pool was acid washed and rinsed. I hoping it comes out or blends in and I don't need to empty the pool and chip it out. I'm wondering what caused the large spot in the deepend. Have tropics blue mini pebble.
Since that's right by the drains, that should be the deepest area and therefore where the acid would have accumulated during the acid wash. It may have gotten over-washed because of that.
 
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