I'm using a DIY CO2 in a 2ft tank with 18 neon tetras... leave them on everyday for 2hrs
I notice that initially, all the ricca's bubbles are all gone in the morning... but now with a lot more bubbles on the ricca, they are some bubbles still left in the morning...
Just experiment with your current setup.... since I have no idea that's your O2 level in the water...
Hope this helps...
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