Zero DO

[Ahab09]

Hi,
I cannot figure out what is happening with my 20 gallon nano.
ph 8.3
Am 0
Ni 0
Na 10 -15
phos .01

canister and power head working surface agitation.

Absolutely no 02 on testing.
What could be taking all the air out of the water?

Thanks.
Ahab09

 

[LeftyReefer]

Do you have a (solid) lid on the tank?

 

[Ahab09]

I have a lid but it is not full. it open at the back not at all air tight so i can understand the o2 being so low.