Hi Lamia, I'm a new betta mommy and new to these forums also...welcome!
Your tank is beautiful! You're betta is going to think he died and went to fishy heaven in that tank!
I have a bubbler in my tank also. If the current is too strong, just buy an adjustment valve at your local pet or fish store, that way you can adjust the amount of air coming through the tubes and make as many or as few bubbles as you like. That's what I did and my little guy loves it. I have mine set on really low and the bubbles cause no current at all. He'll actually swim through and hang out in the bubbles.
Good luck cycling your tank. I only have a 2.5 gallon so I've never been through the cycling process so I can't give any advice in that department. But from the looks of it, you're going to have one happy betta!