ceg4048 said:Clark, a CO2 overdose does not negatively affect oxygen levels. If anything the O2 levels can actually be higher as the plants produce more of it. The fish are not suffering from O2 loss, they are suffering a form of blood poisoning referred to as acidosis. Fish cannot use barometric pressure differences (i.e. exhale) to rid their body of CO2. They must use osmosis. Generally the concentration of CO2 in their blood is higher than the concentration of CO2 in the surrounding water, so the CO2 dissipates outwards across their gill membranes. If the water column CO2 level is higher than that of their bloodstream they cannot purge the blood of CO2 as it flows backwards from the water column into the blood. In effect their blood vessels become a dropchecker. The carbonic acid lowers the blood pH, which affects many of their systems. CO2 buildup is especially toxic to their nervous systems.Superman said:Bit of a shock tonight, I came home from work to find the drop checker bright yellow and most fish gassing. I think I got them just in time. Pointed the spray bar upwards and the koralia is bubbling away to increase oxygen levels in the tank. Phew!
When your tank suffers from a CO2 toxicity you are wasting time and risking their lives by fooling with the spraybar or Koralia. Oxygen is not an issue. Do a massive water change to immediately lower the water column CO2 concentration so that the CO2 in their blood can move across the gills in the right direction and thereby purge their bodies of CO2 and carbonic acid. With individual specimens this can mean the difference between life and death.
but wouldn't moving the spray bar/power head to create massive surface water disturbance drive the co2 out of the water very quickly as well as add oxygen(which as you say is not really going to help)?
so, therefore not be a waste of time as you stated?