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72 gallon bow, 265 WATT CF, XP4, add two power heads on each side of tank... biggest glass diffuser green leaf aquariums sells, pressurized c02, heavy plant load, EI dosing.

20-25 rummy nose, 2 angels, 1 bristle nose, 1 german blue ram, 2 oto, few small danios < taking danios out tho...

so just gonna be 20-25 rumy nose, 2 angel, 1 bristle nose, 1 german blue ram... lets add another german blue ram tho and make it 2 german blue ram totall...

say air stone at night.

how many bps ?
 

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The bubble rate would need to be that which gets the CO2 concentration near where it will be too much for the fish to tolerate, and you would need to maintain good water circulation in the tank, doing weekly or more often pruning to keep from clogging up the water with excessive plant mass. The actual bubble rate will depend on how much surface ripple you have, and you need quite a bit, plus how you diffuse the CO2 into the water, whether you use CO2 mist or just dissolved CO2, and whether you have any filtration or other equipment that degases the water.
 

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Bubbles vary in size. Comparing bubble rates between two tanks is like two people comparing how much their different cars cost to fill with gas.

Hoppy is right on the money, you want the CO2 level to be as high as possible without harming the fish. Keeping proper circulation will help immensely in keeping high oxygen and carbon dioxide levels in the water at the same time.
 

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Also, keep in mind that CO2 demand will change as plants grow, so a few BPS may be plenty in the beginning, but you may need 5x that for a densely planted 72g.

One thing to consider is the limitation of your diffuser. Some methods just wont take too many BPS and others that take the rate, don't diffuse, or dissolve it well and most it lost as bubbles floating to the surface.

get a Drop Checker and let it be your guide. As you increase BPS, watch your diffuser and tank to ensure the increased CO2 is being utulized and not just escaping into your home.
 

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72 gallon bow, 265 WATT CF, XP4, add two power heads on each side of tank... biggest glass diffuser green leaf aquariums sells, pressurized c02, heavy plant load, EI dosing.

20-25 rummy nose, 2 angels, 1 bristle nose, 1 german blue ram, 2 oto, few small danios < taking danios out tho...

so just gonna be 20-25 rumy nose, 2 angel, 1 bristle nose, 1 german blue ram... lets add another german blue ram tho and make it 2 german blue ram totall...

say air stone at night.

how many bps ?
I'm currently running 4 into a vortex style reactor on a 75. It isn't a perfect disolve because I can see some small bubbles. I've misted 2-3 with a powerhead before. Too much and the water gets real bubbly when misting.
 
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