Switching from 75 gal to 120 gal

ChaoticScorpio

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I am upgrading my aquarium from a 75 to a 120 gal. I have heard 2 ways of doing it. One way was to start fresh with some clown fish and let the tank cycle. The other one was taking about 75% of the water from the smaller tank and the top it off. So what do y’all think?


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Im planning on upgrading as well. From what I have read and from what others are saying here on the forum, the best way is to seed the new tank with some live rock from your old tank and let it cycle like a regular new tank. I would stay away from adding the clowns before the cycle is finished because the beginning of the cycle with the ammonia can really hurt the fish in the long run.

You can also do the "new" way of cycling the tank with

https://www.algaebarn.com/shop/aquarium-supplies/chemicals-and-additives/new-aquarium-cycle-pack/

This comes with the beneficial bacteria and an ammonia source to get the cycle started.

Im probably going to go this route with some live rocks from my old tank and new water.

Or you can just add the Fritz turbo start and add the fish right away as the fish will produce the ammonia for the bacteria to "eat"
 
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Ditto on @ZapataInc . All of this! And Turbostart is a great bottle to go with if you’re looking for nitrifying bacteria.

If your goal is to be fast; use your old tank water! If your goal is to be clean, then mix new tank water with 100% dry rock. I’ve done both; depending on my goals.

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Regarding Tank Cycling, I think it’s important for beginner readers considering this to understand:

I disagree that so many companies push products onto others for immediate cycling of a tank; that’s not how it works.

Cycling takes time (plus it is not a process that ever completes; it is ongoing). Adding these chemicals can facilitate the process. Essentially, the act of cycling allows water to permeate your rockwork, organics to decompose, and nitrifying bacteria to disperse and reproduce through multiple generations and create a stable population for the given amount of nutrients. At that point; it’s slightly more correct to say that you’ve ‘allowed your tank to cycle’ but can be misleading to say that ‘the tank is cycled (implying completeness)’. But clown fish are tanks! And can handle anything.

By analogy, being able to feed your kids and have a safe home won’t make them become adults any faster. You’ll still have to wait 18 years for them to be 18. However, it will allow you to have more kids and at a younger age. So it increases growth rate, but only to a certain degree. There’s no substitute for a little time to help develop a robust population and stable parameters.
 
Do you have live rock and all that other stuff in you 75g that you could move over to your new setup? I'm assuming not but thought I would ask. If you are, you should be able to make the upgrade without much of a cycle at all as long as you don't increase the bioload for a while. Typically you'll lose the beneficial bacteria that's found in the sand so you'll need to keep an eye on ammonia levels for a little while.

Either way, the first thing I do when I start planning a tank swap or upgrade is place a few bags of Seachem's Matrix (or similar product) in the existing system so I can move those beneficial bacteria to the new system.
 
Do you have live rock and all that other stuff in you 75g that you could move over to your new setup? I'm assuming not but thought I would ask.

Yes, I do have live rock, although I have to by a little more. So my thought is to add some from the 75 gal. Tank and add new rock to it. Then add the rest when I do the final move. I am also order to get the starter pack from the algae barn.




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I like to think of the bacteria vs bioload as one of those old timy balance scales. Bioload on one side and the bacteria that consumes it on the other. You mention starting the new system with clown fish. I'd bet that if you use a few pieces of live rock from your old system, there wouldn't be a cycle with such a small bioload (2 clowns). The existing bacteria in the live rock would be able to consume the organics from such a small load. All the while bacteria would be growing in the new substrate and new pieces of rock.
 
ive done this in the past i just setup the new tank and took a few pieces of live rock from my old tank and put it in the new tank and i didn't experience a cycle
 
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