Upgrading Tank Size

maxxd97

Registered Member
Nov 18, 2004
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Hi all!

I have a 5 gallon tank and really want to upgrade to a 10 or 20 gallon in the next week or so. My question is can I use the water that is in my 5 gallon to start it up, or should I start a brand new cycle? The water in there now is very healthy, and has had the same fish for about a year or so.
 
I thought that if the ammonia levels are set in the water that it would be okay to have that water and add the rest since the aquarium is established in the tank I have now.
 
The good bacteria isnt in the water though so there will be no good bacteria getting rid of the ammonia and nitrites you fish will be creating.
 
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