HOB Filter question

[poppalina]

When moving my fish from one tank to another ,I like to keep the environment they are leaving and going too, to be as close as possible to cut down on the stress to the fish.

 

[swifty]

Good point, but what would be the purpose of putting old water in the other tank he's setting up? One tank is becoming 2 tanks. Sounds like the 29 is the upgrade and the 20 is a new setup. I could be wrong

Just trying to understand the logic of putting old water in the tank without stock.


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Yeah, that's the idea. The 29g I'm planning to keep as a home for my firemouth, and the 20g I'm planning on putting a lone female salvini.