My Blck Cory is dead!

With higher c02, more 02 is required..... better surface movement and more 02 will allow for more c02.....

Or option 2 will also work.........

IMO, more 02 is NOT a bad thing, esp when injecting c02.....

Sorry to hear about your fish.......

 

I Think The CO2 Is Fine.

Hi Geoff,

I am sorry to hear of the loss of your Cory.

I need to point out that it is unlikely bordering on impossible to kill Callichthyids with CO2 or low Oxygen saturation. Many of the “catfish” breathe air when water conditions are poor; Callichthyids breathe air anytime they wish.

Further, the fish behavior of the fish “going to the bottom” is inconsistent with signs of CO2 toxicity or oxygen deprivation.

The first sign of hypoxia in fish is actually lethargy; you mammals expend 1% or so of your energy on respiration, whereas fish expend 10%.

Among the most common error in fish keeping is considering lethargic fish ill (diseased), medications are added often further decreasing O2, reinforcing the idea that the fish are “sick.”

Many do not recognize hypoxia until the fish are gasping at the surface.

http://www.sci.sdsu.edu/classes/bio100/Lectures/Lect16/lect16.html a nice primer on respiration.
http://www.unuftp.is/static/fellows/document/yovita07prf.pdf More for the aquaculture community but page 11 or 12 starts an interesting and pertinent piece on fish and respiration.
http://www.holar.is/aquafarmer/node18.html a “down and dirty” guide to fish respiration


Would you care to tell us more about your aquarium? Perhaps we can figure out what happened.

Biollante