Barliman
Aquarium Advice Addict
Okay, that was weird. I was doing tank maintenance on one of my aquaria today and checked to if the Purigen needed changing. Instead of the dark brown I expected, the resin had turned brick red. I've never seen that before. Water quality was fine, other than high nitrates (hence the maintenance), and the fish are healthy and active.
Anyone have an idea of what happened?
Anyone have an idea of what happened?