Do you need to cycle tank if...?

[gn3ranger]

Would I need to cycle a 29 gallon tank If I use some water from my 10 gallon tank to fill it up? Just asking I may buy a 29g tank in the near future.

[bahamut285]

Yes because there are very few (if any) beneficial bacteria in the water column.

It would be better if you used gravel or filter media from your 10 gallon

[vilmarisv]

Bahamut is correct. IF your 10 galon is fully cycled you'll be able to transfer some of the bacteria in the gravel BUT the tank will still go through a mini cycle and you need to test again until it's fully cycled.