Okay here's the details.
Just set up a 20 gallon long 2 weeks ago. Have 2 OC clowns in it. Running an aquatech 30-60 hob
with pillow floss.
Today I noticed pink spots in my rocks. Only outside introduction to the tank was about a 1/4 cup of sand from a friends tank to help cycle the rocks (fishless, in a bucket for almost 2 months, amm, trites read zero before fish).
I also used about half a gallon of sand from another tank that I rinsed pretty good but still ended up getting some ammonia reading off of it for a couple days until the bacteria took care of it.
What could it be?
Here are the stats:
Nitrite: didn't test (it was 0 a couple days ago)
Nitrate: 20 ppm
Phosphates: 0.25 (from a couple days ago)
Here's a picture