Oxygen in the water...

[phanmc]

Unless your water temperature is in the high 80s and 90s, it can be addressed by surface agitation and water circulation.

Stocking level I already talked about, DOCs and nitrate levels would be a bigger concern before O2.

I did forget to mention that good water circulation is important to distribute the oxygen that diffuses from the water surface. Most HOBs that are rated for a tank size usually provides enough of that as well. If the circulation is insufficient a powerhead would solve that problem.

 

[musho3210]

well a 60 degree tank with the same surface agiation as a 75 degrees tank, which will have more oxygen (60 degrees) H3D is correct in adding the temperature since the lower the temp, the more oxygen, this is how fish survive in lakes that have frozen over since the oxygen level is high enough to keep the fish alive until the ice melts.

 

[nickmcmechan]

Well, if you want to overstock you need

1. hardy fish
2. daily pwcs
3. massively over the top filtration, look at what you need double it, then ad another one

Point 2 being the most important, who can you trust to do pwcs when your not around...away for the weekend, on vacation etc.

Then theres all the additional stress on the fish.....

Just buy a bigger tank!