I never used to, then I read an article on the differences between transmission of light through tank water and sea water and aged tank water that's not seen a water change in a while and not running carbon was drastically different in colour and transmissibility than actual reef water. Even if you can't see it with your eyes, 2 weeks after a water change your water will be quite yellowed.
I've started running carbon passively as a result, but not every day. I'm nervous about it causing HLLE.
|