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post #1 of 5 (permalink) Old 08-07-2017, 04:23 AM Thread Starter
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Dead fish

When I started up my 30 gallon tank, I set up a 2 liter bottle with the sugar/yeast mix. The glass difusor was situated right under the intake of my filter uptake so most of the bubbles went into the filter. I bought 9 neon tetras, and the next morning, multiple were dead. Actually, they started acting funny within hours of being introduced into the tank. After another day the rest were dead. They swam really funny like thy were drunk. I'm convinced it's the DIY because the ph and other levels tested fine. I yanked out the system, and the fish I've added since are doing well. How do you add CO2 without killing fish??? For now I'm sticking with my excel which many people rave about.
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post #2 of 5 (permalink) Old 08-07-2017, 04:25 AM
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When I started up my 30 gallon tank, I set up a 2 liter bottle with the sugar/yeast mix. The glass difusor was situated right under the intake of my filter uptake so most of the bubbles went into the filter. I bought 9 neon tetras, and the next morning, multiple were dead. Actually, they started acting funny within hours of being introduced into the tank. After another day the rest were dead. They swam really funny like thy were drunk. I'm convinced it's the DIY because the ph and other levels tested fine. I yanked out the system, and the fish I've added since are doing well. How do you add CO2 without killing fish??? For now I'm sticking with my excel which many people rave about.
Add surface agitation to increase gas exchange. You could also add an air stone.

Just a noob


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post #3 of 5 (permalink) Old 08-07-2017, 04:30 AM
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"Most of the bubbles", how many bubbles per minute/second was the sugar/yeast mix producing? Were the fish gasping at the surface of the tank?

Let me get this straight. You had fish acting drunk, and didn't bother to offer giving them some water to drink? In all seriousness...you noticed that something was wrong, and didn't do anything?

So many fish to keep, not enough aquaria.
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post #4 of 5 (permalink) Old 08-07-2017, 04:41 AM
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Originally Posted by Kevin1983 View Post
When I started up my 30 gallon tank, I set up a 2 liter bottle with the sugar/yeast mix. The glass difusor was situated right under the intake of my filter uptake so most of the bubbles went into the filter. I bought 9 neon tetras, and the next morning, multiple were dead. Actually, they started acting funny within hours of being introduced into the tank. After another day the rest were dead. They swam really funny like thy were drunk. I'm convinced it's the DIY because the ph and other levels tested fine. I yanked out the system, and the fish I've added since are doing well. How do you add CO2 without killing fish??? For now I'm sticking with my excel which many people rave about.
I have to agree with the others. We need more information to help. But at the very least you should have a bubble counter to tell us about how many bubbles per second you are injecting. Secondly it would be beneficial to have a drop checker to measure how much CO2 there is in the water. With yeast CO2 I imagine you leave it on all night. plants don't use the CO2 at night which causes a buildup. At night you need to have a way to create a lot of surface agitation to remove CO2 from the water while allowing air to get back in. Airstones work well and so do wavemakers and the like.
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post #5 of 5 (permalink) Old 08-08-2017, 02:52 AM Thread Starter
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As soon as I noticed something was wrong I took out the CO2.
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