I have some stuff that is bright yellow with brown spots growing on some of the silicone in my sump. I used Aqueon Silicone. It only seems to appear on the silicone that is under the moving water, not on places that are submerged in water. There isn't a light on the side of the sump I see it on.
I used a paper towel to wipe some of it off, and it appears red/rust colored on the towel and stinks like mold.
I used dry rock and sand in my tank. I used janitor strength ammonia from Ace and Seachem Prime to cycle it. I noticed it started during the nitrite spike in the cycle.
Any ideas what it is and if it's harmful to the future inhabitants of the tank?
I used a paper towel to wipe some of it off, and it appears red/rust colored on the towel and stinks like mold.
I used dry rock and sand in my tank. I used janitor strength ammonia from Ace and Seachem Prime to cycle it. I noticed it started during the nitrite spike in the cycle.
Any ideas what it is and if it's harmful to the future inhabitants of the tank?