Activated carbon has been removed from my filter compartment. This is due to suspected low in nutritional in aquarium.

I have been using this carbon from the start and now 2 of my tangs suffer HLLE. Im believe is this is the main cause for the disease. For now they are ok, response to feeding very well. The only thing is its not very pleasure to watch them with some mark on the face and lateral line worn away.

I'm not sure if other thing cause this "environment problem", so far i concern all other water parameter are good. The only thing i can do now, doing WC normally and no more activated in the system.

Food provided also consider ok, not sure if not enough lol since i have provide them with about 5 different pallet and nori.

As for now let see if they can do better without activated carbon