How to get rid of these red stuff?

[Enigma]

Originally Posted by reefwars

sounds expensive:P

It was! Over $40 for both bottles.

I normally dose nitrifying bacteria, so I'm okay with that expense (I see it as a little bit of insurance). The nitrate reducing polymer isn't something I would normally use, but that was a 1/3 the price of the BIO-Spira so I figured I may as well try it in conjunction with the bacteria.