Quote:
Originally Posted by KaLiB
This article is from the Coral Reef & Aquarium Magazine. A study was funded by Toledo Zoo on the use of carbon and HLLE. It also includes a study on diet and HLLE(offered as a preliminary result).
Activated Carbon: HLLE Smoking Gun Found
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No all types of carbon will cause HLLE on fish . Using good brand like Rowa, Ehiem is the way to go. I have been running Rowa carbon on my fish only system for about 3 year now and i didnt see any problem with it.