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Re: Yeast Co2

Matt wrote:

1-Fill the carboy with warm water 1/2 full.
2- Add 10lbs of sugar
3- Add Yeast Energizer and mix well
4- Top up carboy with water to 3/4 full
5- Dissolve the yeast in a cup of warm water, let it sit for 1/2 hour
6- Pour yeast into carboy, DO NOT STIR.
7- Install rubber stopper
8- Insert a length of plastic airline into the hole in the rubber
stopper and silicone in place.
9- Drain the aquarium water a couple of inches below your powerheads.
10- With a red hot piece of metal melt a hole in one of your UG filter
lift tubes 2" below your powerhead the size of the OD of the plastic
11- Insert the end of the airline coming from the carboy into the hole
in the lift tube and glue in place if necessary.
12- Put the carboy behind the tank or under your stand and leave it
13- Fill your tank

I saw this on an old APD post, does anyone know if there'd be a pH hit MORE
than a regular 3 cups of sugar and 1 tsp of yeast in a 2Litre bottle? I'm
curious about doing this on a 10 gallon... Usually my pH doesn't go below
6.4 with my soda bottle, so I'm curious if it would be different with this..

I reply:

That recipe is insane. Certain death for any fish in a small tank. The yeast
energizer will allow the yeast to quickly reproduce and produce a huge
amount of CO2. It is very undesirable to add yeast energizer to the
beginning of a fermentation unless you are trying to make wine. The output
will be initially very high but quickly drop off to much lower levels.

A better recipe would be 1 1/2 cups of sugar, 1/4 tsp Saccharomyces
cerevisiae wine yeast, 1 1/2 liters of water and 1 tsp. baking soda in a 2
liter bottle. Follow the directions on the yeast packet for adding the
yeast. After 10 days add another 1/4 tsp.of yeast and after 10 more days one
more. After 6 weeks change the bottle. Sometimes 1/4 tsp. of yeast is not
enough to get a fermentation going properly and you can add a little more
but don't overdo it.

Even under the best of circumstances 3 cups of sugar in a two liter bottle
will never be consumed by the yeast. There is no point in exceeding 1/4 cup
of sugar per cup of water.

Wayne Jones

My DIY planted aquarium homepage: