linilkuruvilla

Hi all, just set up a dry start fish tank and that is a week old. Still going good and I have been accumulating equipment by the time I will be ready to flood. So my questions:

* I have another cycled tank already, so will it be good to run my new hob filter there first so that the bacteria can grow in this and then help in the new tank?

*Second, with HOB filter, where will my Co2 diffuser be placed in tank. Some say with HOB it does not matter since the water exchange happens faster than an external filter. Is it a valid explanation?

Just for info, my tank is a 30gallon and filter will be Seaschem tidal35.

mudboots

Certainly running a filter on an established tank will pick up whatever that tank has, so technically, yes, you will be seeding your new tank when you transfer the filter. Another way to do that if the HOB takes the same size cartridges is to just transfer the cartridge. I don't know about adding CO2 though and how you air exchange will effect your CO2 inputs. I have had tanks with zero CO2 inputs, and some with liquid supplements, but have never done the pressurized gas.