Newbie needs help with 6 month old tank!


Junior Poster
Aug 3, 2007
Baltimore, MD
30 gal with good substrate. 2 Turbo Co2 BIO Systems with reactors with ph contoller. 2x65 pc lights on for 11 hours. ph=7.2, kh=4,gh=6 .I have algae problems. Started EI dosing about a week ago, and i see better growth in plants. Algae still growing. It seems I cannot keep enough dissolved co2 in water. Have a red sea co2 indicator and it is amost always blue. (low co2) Please help!


Lifetime Charter Member
Lifetime Member
Jan 24, 2005
Sacramento, CA
The pH controller is useless for controlling the amount of CO2 in the water if you are using yeast and sugar to generate CO2. You can just let the CO2 go as high as the system will generate, and maybe use a Barr internal venturi reactor to keep the dissolved amount from being too high, as unlikely as that is. Or you can increase the water surface ripple by changing the direction of the filter flow into the tank, to get rid of some of the CO2 excess. Use the red sea CO2 indicator, with 4 dKH distilled water in it to measure the amount of CO2 in the water.

You also have too much light and you keep it on too long. 130 watts for a 30 gallon tank is about twice what you need, and 8 to 10 hours is as long as the lights should be on. Having too much light makes avoiding algae very difficult.

Now that you have algae problems you need to remove as much of it from the tank as you can, change water very often, and maintain good CO2 and other nutrient levels to try to stop it from coming back.