I can send you some gravel from my 29 gallon that is cycled but that might take a few days.
![dunno :dunno: :dunno:](/images/smilies/ipb/Dunno.gif)
When we first got our male betta, we didn't know about cycling so we kept him in a 1.5 gallon bowl and did water changes like every 2-3 days and he lived for 3 years...would have lived longer but my little sister did a water change and didn't know you had to use dechlor.
Anyways, I think it would be fine to leave your tank uncycled as long as your committed to do frequent water changes. I agree that water changes with sand will take more time than water changes with gravel, but if you have the time then I would go with sand as I love it in my 120 gallon.
About females and the currents and all that stuff...My tiny female betta (She is only an inch IF that) had a really hard time even in a 10 gallon with a filter as she was blown everywhere and had a hard time searching for food. She got really skinny and I tried her in the 120 gallon as well and she didn't eat and stayed in a corner all the time. So I removed her and put her back in the 10 gallon without the filter/current and she is doing fine! She is a bright red now and getting fatter.
![Stick Out Tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
She is still about an inch though.
![/ :/ :/](/images/smilies/ipb/confused.gif)
I don't think she will ever grow, that is why I am afraid putting her in with any other females since she is so small. My female betta is fine by herself and seems happy. I have a moneywort plant in there and another tall plant I am not sure the name of, she also has a little plastic plant and a cave. She likes the cave, I just added it today for her.
I also have 12 female bettas in the 120 gallon and there is very minimun flaring and nipping. And when there is, it is always the same few bettas. The others are pretty docile and have a good time swimming all around the tank together. If you get them young, maybe they will tolerate each other in the 5 gallon but I would make sure you have a separate tank you can split them up if anything goes wrong. Goodluck!
I am also thinking about getting another tiny female for my current female. I think she would like the company, but I need to make sure I get one as small or smaller than her.
![nod :nod: :nod:](/images/smilies/ipb/yes.gif)