Who Gives A Fish Forums

Thanks for the suggestions. I'll test my RODI and cut back feeding. Didn't think about the skimmer cup—it's pretty full.

My nitrate levels shot up to 40 ppm overnight in my 75-gallon mixed reef. Running a Red Sea Reefer with two AI Hydra 32s, weekly 10% water changes, and a Reef Octopus skimmer. Corals look stressed, especially the Acropora. Any ideas what's causing this?

Afternoon everyone,

Just a quick hello before I start bombarding you all with questions. I've recently upgraded from a 200l tropical setup to a 450l Malawi setup, and I'm excited to learn from you all.

My tank's currently set up with a Coflake sand base and plenty of ocean rock. I've got two ...