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With only three fish, assuming they are small now (yes, they are way to big for your tank when they grow out. They are a 12"+ fish) and plants you won't see many nitrites or nitrates as the plants (depending on what variety) can take up ammonia anywhere from 5 to 50 time faster than any bacteria/archaea will. Tis effectively bypasses the whole nitrogen cycle. Eventually you will have nitrates build up but slowly. I have over 20 fish in a 37 gallon and I have yet to see nitrates over 5ppm even after a 3week span between water changes.

What plants do you have?

What are your plans when the loaches outgrow your tank?

What other fish are you considering?

Jeff.
 

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With plants you can just step into your planned routine of weekly changes. Keep testing for ammonia and nitrites frequently until a few weeks after fully stocked. Put each species in together and leave two or three weeks between additions. It wouldn't hurt to keep upping the plants in between as well. Even toss in some cheap fast growing stems to help buffer everything while it starting.

Cory's and loaches should go in last.

You could stock the first batch anytime.

Jeff
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