As far as the airwand:
If you are not adding CO2 (you can use Flourish Excel as a carbon source) then the air wand can stay. But, you don't actually need it. The plants provide oxygen during the day. If you just have some surface ripple, that is enough to provide gas exchange in the aquarium.
If you are using DIY CO2 (sugar + yeast method), then take the air wand out all-together. Any CO2 you add to the tank will get released into the air due to the air wand. Using DIY, you will not produce enough CO2 to kill or harm your fish at night when the plants are not taking in CO2. (I have 2 1-gallon jugs with double recipe going 24/7 on a 50 gal and have no problems...and no air bubbles.)
But, if you feel safer with it, you can use it at night to release the CO2 from the tank. Again, some surface ripple is sufficient to provide gas exchange.
If you inject CO2 with a canister (compressed CO2 system), then you can use the air wand during the night to get rid of CO2 when the plants are not using it, or, just turn off the CO2 at night so you aren't wasting it, and then you can still either keep or ditch the airwand.
Hope that helps.
-Dave
If you are not adding CO2 (you can use Flourish Excel as a carbon source) then the air wand can stay. But, you don't actually need it. The plants provide oxygen during the day. If you just have some surface ripple, that is enough to provide gas exchange in the aquarium.
If you are using DIY CO2 (sugar + yeast method), then take the air wand out all-together. Any CO2 you add to the tank will get released into the air due to the air wand. Using DIY, you will not produce enough CO2 to kill or harm your fish at night when the plants are not taking in CO2. (I have 2 1-gallon jugs with double recipe going 24/7 on a 50 gal and have no problems...and no air bubbles.)
But, if you feel safer with it, you can use it at night to release the CO2 from the tank. Again, some surface ripple is sufficient to provide gas exchange.
If you inject CO2 with a canister (compressed CO2 system), then you can use the air wand during the night to get rid of CO2 when the plants are not using it, or, just turn off the CO2 at night so you aren't wasting it, and then you can still either keep or ditch the airwand.
Hope that helps.
-Dave