If you're moving everything from the 29g into the new 75g then I would just run the filter along with the new filter on the 75g. Give it a few months and you can safely remove the old filter. Just be sure to give it at least a week before buying any new fish for the tank and to keep an eye on ammonia for the first week or so.
Not buying new fish for the week would mean not adding more fish then there already are. If you already have 10 guppies on that filter, then adding another 10 would increase the chance of an ammonia spike.l because a lot of bb is lost on a tank switchWon't the bb need a food source if there no inhabitants for a week?
The op could dose ammonia during the first week while testing daily to get an idea of how bio-filter is processing the ammo...
sit in silence...
Like title says, how can I cycle my new 75G tank with media from my 29G tank? Will it be an instant cycle? Can I swap out fish right away?
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Not buying new fish for the week would mean not adding more fish then there already are. If you already have 10 guppies on that filter, then adding another 10 would increase the chance of an ammonia spike.l because a lot of bb is lost on a tank switch
Bb can live for up to a month without an ammonia source in any case.