I started cycling my tank about 3 days ago. 125g 110lbs live rock 50lbs base rock. Anyway, I got this yellow tint in there that been there for about 1-1.5 days. Just curious to what it is. I dont know if it is the rock. The guy told me it was fully cured but I saw some small black areas on a few of them which I believe means that the curing process isnt done if I'm not mistaken. But I dont know if that would cause that or not. I know it doesnt matter cuz I'm sure it will clear up as with most things and I'm in the baby stages of cycling but I was just wondering if anyone could explain it.