What in the heck!?

[Brian Ahmer <ahmer.1@osu.edu>]

Here's a stumper for you.  I have a 75 gallon planted tank.  It has 
potting soil under gravel for a substrate, tons of plants, some 
cory's, 2 discus, 2 viejita, 4 rams.  I have a Magnum 350 hooked to 
it just to circulate the water (no filter media in it).  The water 
was tap cut with RO.   The pH never wanted to drop naturally so I 
added seachem acid buffer on occasion to keep the pH under 6.5.  All 
the fish have been great since I started the tank 6 months ago.  Rams 
spawned all the time but babies would disappear.  OK, enough 
background...

Two days ago, I opened the Magnum 350 and added a canister of rinsed 
Black Diamond carbon.  Today, I came home and all of the fish were 
dead except 1 ram and 1 cory.

What's up with that!?
--

Brian Ahmer
ahmer.1@osu.edu
http://www.angelfire.com/or/biggestbri


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