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I've got a fully planted tank
20 gallon tank
30 cherry shrimps
some small raspboras

My c02 went empty last night - YIKES
and the refill won't happen until monday because they are closed.


I already see my PH is changing. Any suggestions of whta to do for the next 48 hours? Freaking out here.
 

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Nothing to worry about.

To prevent algae outbreaks reduce the photo period by a few hours until the CO2 is refilled. And if you have any surface agitation (through spray wands, HOB waterfall filters etc) - turn them off or adjust the water return so the surface is not disturbed. Anything else that brings in air bubbles should also be turned down. This will help keep CO2 in the water longer.
 

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I wouldn't worry about losing the CO2. The plants will eat up any left in the water. Surface agitation is good for the fish and the plants can get by on what CO2 is picked up from the air. Reduce the photo period until you are back up and running CO2 again is good advice to reduce any algae issues.
 

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Is your normal setup a PB setup? I don't have a PB setup, but keep a 24oz PB tank that I only use when I run out and can't get more. If it is a standard tank, they 2.5lb tanks that you can do the same with. I have one of both as backups. They are fairly cheap to buy.
 

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I wouldn't worry about it. Like others have said, reduce your photo period and just relax.

But you could also check with sporting goods stores, as many offer CO2 refills and don't advertise it for some reason.
For next time, as jrman said, have a backup plan. Granted buying an extra tank is not always ideal, or available for many of us money wise, but knowing where you can get CO2 refills on the weekend is a good start.
 
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