View Full Version : Is this hole in the head?

03/04/2009, 10:31 AM
I've been running my 125gal salt water tank for about 5 months (using dechlorinated tap water), and am now switching to RO/DI water.

My butterfly now has this skin deterioration above his head. Nitrite & Ammonia levels are low... I haven't tested for NitrATE yet, but I did a 10% water change two weeks ago and about once a month before that.

Any idea what this illness is and how i can treat it? This butterfly & my foxface are my only medium sized fish. I have about 5 other small fish so the tank isn't stocked heavily. My SG is 1.019 and has been that way for a few months as I don't have coral.

Any advice, input would be greatly appreciated!

<img src="http://lh6.ggpht.com/_rkT0KOmW5Y0/Sa65jTQmHgI/AAAAAAAAIgs/07TyzrFOPbE/s800/Fish%20tank-120.jpg" />