Not sure if they are available just yet for public sales. I remember @FullDuplex saying he'd make a post letting us know. I know I'm wanting some also.
I keep seeing these dire warnings about tank temperature with DWC getting too warm when it comes to oxygen availability.
The fact is that O2 solubility in water decreases with elevations in temperature, but a little research seems to indicate that the warnings out there are a bit exaggerated.
The suggested tank temperature is 75F/24C and at that temperature, the O2 saturation is 8.4 mg/L. At 80F/27C, it's 8 mg/L. Not a very dramatic drop.
As long as you use an airstone, and unless I am missing something, elevated water temperatures present more of a problem with bacteria/algae growth than they do with oxygen saturation.
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