My daughter has a betta and asked for a bigger tank for Christmas. Right now he is in a little 2 gallon thing with some plants, moss and a goofy castle and netting to keep him from jumping. The new tank is either 5 or 6 gallons(cant remember right now), has a filter and a hood with a light.
He will be much happier here! More on the goofy castle -- since Bettas are air-breathers, make sure that there are NO holes in decor. Bettas can swim in, get trapped, and drown. It's an awful thing to have happen. I have never seen your castle, so I don't know if it has holes, but I just wanted to let you know.
It will have a gravel bottom, driftwood and live plants and she is dying to have one of the Briggs snails I just bought for my sons 20 gallon tank, but I need to look into that first to see if they can be together.
This is a possibility. The Betta may pick on the snail's antenna, causing injury, and when these snails get injured, they usually don't fare too well. Also, ensure that you've got the proper pH (at least 7.4 or so) and KH (5 or 6 would be best) to keep this snail alive. Without proper pH and KH, the snails' shells seem to disintegrate, causing eventual death.
She would also like one other fish with the betta, but again, I have to look into who could live with him.
In this volume, I'd stick with the Betta. I've got a Betta in a 5 gallon, and enjoy the low maintenance it provides. I've even gotten down to 0 Nitrate in this tank! Also, when schooling fish (such as Neon Tetras, a fish commonly kept in small tanks) are kept singly, they tend to nip, or like the Corydoras catfish, commonly kept with Bettas, are unhappy or lonely when kept singly. Danios are often kept with Bettas, but are actually happier in much cooler temperatures. I'd say that if you must select a tankmate, select carefully.
Im wondering about cycling the new tank though. Can I put the water from his old tank into the new tank, top it off, leave it for a few days and would it be cycled by then or at least not take as long to cycle?
Most of the beneficial bacteria that you're looking for is attached to stuff -- most likely, the media in the filter, and on a much lesser level, the gravel. There's virtually none in the water.
How long will it take?
Well, this depends. If you borrow media from a cycled filter and place it in the filter of the new tank, you can add Jasper immediately. You could also purchase a bacteria-in-a-bottle, but be careful, because many of them are useless. One which I can vouch for is Dr. Tim's One And Only. This product literally allows you to add fish the next day with no Ammonia or Nitrite spikes. If you don't do either of these, expect the usual cycling process time.
She is going to want to put Jasper in right away but if I can give her a time, she might be more patient. Id also like to get something that is sort of grassy looking to put on the bottom of the tank, but Im not sure what to look for.
I don't know this one, because I have only had experience with Anubias on driftwood in my own small tank! Hopefully someone else who is experienced with plants will chime in here!
Any ideas?
Pretty much those which are included in the above novel LOL.
Can I use the snails for cycling?
I wouldn't, if you want the snails to survive.