Replacing a tank

[ElizabethFrancine]

Instant cycle - works every time! (Learned many years ago from the Bailey Brothers, PetFishTalk - "seeding your new aquarium with beneficial bacteria" in Aquarium Water podcast.)

Thanks for this link. I’m going to check out a few of their podcasts.


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[NickAu]

The reason you use the old water is so the fish don't suffer from too much shock if the new water is not exactly the same as the old water.

I guess you have never done 90% water changes? If the water is treated and heated to the same temp a in the tank its not a problem.

I have even done this with shrimp and big water changes on shrimp tanks are usually a big no no.

 

[Colin_T]

I use to do 90% water changes all the time using aged dechlorinated water. The big issue when moving fish to another tank is the stress placed on the fish when they are caught, put into holding containers for several hours (or longer), and then put into a new tank. By keeping them in the old water and adding clean water, it is less stressful to the fish compared to being put into 100% new water that has only been made up then and there.

Unless you match the pH, GH, KH & temperature to the old water, the fish will suffer more stress on top of the stress of being caught, manhandled, moved into a bucket, caught again and put into a tank.

 

[ElizabethFrancine]

I was able to get the new filter this weekend. Its an AquaClear 70. Should I run both on my old tank, or should I swap it out for my old filter?


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[Colin_T]

run both filters on the new tank for 2 months then either remove the old one, or keep it running and use it as a filter for a quarantine tank when you get new fish.

 

[ElizabethFrancine]

run both filters on the new tank for 2 months then either remove the old one, or keep it running and use it as a filter for a quarantine tank when you get new fish.

Thank you! Will do!


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[AbbeysDad]

Unless you match the pH, GH, KH & temperature to the old water, the fish will suffer more stress on top of the stress of being caught, manhandled, moved into a bucket, caught again and put into a tank.

Not my experience.
While the reverse might be true, I do not believe that less polluted, FRESHER water creates more stress. Obviously the temperature should be the same and we might conclude that especially in this case, the fresh water in the new tank should be enough similar in chemistry to the old tank water.

I have moved dozens and dozens of fish (including fry) from established tanks into new (instant) cycled tanks always with positive results. I've never lost a single fish doing this.