Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Moving an established tank and just giving things a quick rinse is usually safe for the nitrifying bacteria, though there may be some loss. If the things dried out, or got too hot that would be bad.
In your first post you said he cycled it for a week. Exactly what did he do?
Run it without feeding the bacteria? That would greatly reduce the population.
Did he add ammonia to feed the bacteria? That would enhance the population.
Were there fish in the tank when you took it from your brother's place?
If there were no fish for a while, then the bacteria population was way down.
If there were fish, how many, and what sizes?
Do you also have test strips for ammonia?
Here is what I would test for:
and any other tests you might have.
Run these tests on the tanks and the tap water. Run the pH test twice on the tap water. Once, right out of the faucet, and a second time on some water that has sat out on the counter overnight, 24-48 hours.
Post all the answers, and the correct units in a way that is easy to read.
List everything that is being added to the water, include brand names, and dosages.