Upgrade 20g to 44g pentagon process suggestions - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 4 Old 06-09-2012, 02:30 AM Thread Starter
Upgrade 20g to 44g pentagon process suggestions

Can i change over to new tank all in same day Dont plan to keep 20g running. All is good in current tank. Thanks for your help
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post #2 of 4 Old 06-09-2012, 10:53 AM
Originally Posted by bohmert View Post
Can i change over to new tank all in same day Dont plan to keep 20g running. All is good in current tank. Thanks for your help
yup just change the water over from the 20 to the 40 and add the rest like a water change.put the gravel in there too and add as you see fit.but there will be no need for cycle because all the bacteria will be in the old water and on the gravel and decor.
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post #3 of 4 Old 06-09-2012, 11:54 AM
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There is no nitrifying bacteria in the water, but there are some other bad things, so moving water is questionable, as I will explain below.

Do you intend to use the same substrate? Presumably more will be needed in the 40g than what is in the 20g.

If you do use the substrate, and any decor items now in the 20g (rock, wood, etc), do not wash any of these as this might remove/kill the bacteria. When you get the substrate in the new tank, half fill it with fresh water using a dechlorinator (water conditioner) to avoid killing the bacteria in the substrate. Then move over the decor and any plants.

At this point, if the GH and pH of the tap is close to the existing tank, fill the new tank (use dechlorinator again). Drain half or more of the water out of the 20g, and refill with fresh (like a water change). This can be repeated. Then net over the fish.


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #4 of 4 Old 06-09-2012, 03:30 PM Thread Starter
yes, i do plan to move all current item gravel live plants and fish to new tank got more rocks today ordered aquaclear filter I use prime for water conditioner
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