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you can have a sump and not off gas co2... my set up is great... 125 gal with 4bps and my drop cheker is green/yellow
sumps just needs to be set up in a different way so that the typical large cascading water down an overflow and down into the sump is minimal

do you have a way to check your co2 levels in your tank? how are you putting co2 in the tank pressurized or diy?

adding mono potassium phosphate will help with your phosphate levels

also which kind of green algae? dust or spot?

how many hours are you running your lights?
 
you can have a sump and not off gas co2... my set up is great... 125 gal with 4bps and my drop cheker is green/yellow
sumps just needs to be set up in a different way so that the typical large cascading water down an overflow and down into the sump is minimal

do you have a way to check your co2 levels in your tank? how are you putting co2 in the tank pressurized or diy?

adding mono potassium phosphate will help with your phosphate levels

also which kind of green algae? dust or spot?

how many hours are you running your lights?

I am putting my co2 stright into my tank. it is a pressurized running through a diffuser. Do you happen to have a picture of your sump to see how you have yours set up? I think i have a dust algae, i am also running the lights 8 hours a day.
 
you can have a sump and not off gas co2... my set up is great... 125 gal with 4bps and my drop cheker is green/yellow
sumps just needs to be set up in a different way so that the typical large cascading water down an overflow and down into the sump is minimal

do you have a way to check your co2 levels in your tank? how are you putting co2 in the tank pressurized or diy?

adding mono potassium phosphate will help with your phosphate levels

also which kind of green algae? dust or spot?

how many hours are you running your lights?
:iagree:
this is the sump set up I have.. you can seal off the main chamber and not lose much CO2 as it is trapped in the chamber the water passing over the
bio balls is exposed to the trapped CO2.
the water level in the sump is controlled by the baffles . on mine the water level goes about an inch or two above the bottom of the bio balls

sump.jpg
 
:iagree:
this is the sump set up I have.. you can seal off the main chamber and not lose much CO2 as it is trapped in the chamber the water passing over the
bio balls is exposed to the trapped CO2.
the water level in the sump is controlled by the baffles . on mine the water level goes about an inch or two above the bottom of the bio balls

I have a diy sump, i am using rubbermaid tubs. Do you think there is any way to seal them off.
 
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