u/Educational-Bit5412

I want to upgrade my betta from a 5 to a 10 gallon but im unsure if the shape will have any effects on his health
The last pic is his current tank

These are all my pets and their set ups. I know the crestie should be in a larger tank but he was a recent and most importantly unexpected resident given to me, and ive done the best i could with what i had on hand. There are 2 red eyes but only one is out.

Sticky was given to me about a month ago, i was not prepared for a gecko at all, but i did my absolute best with what i had. Its fully bioactive 30x18x30 with springtails and isopods, i plan on adding more plants soon as-well. I know its not a 2x2x4 as a lot of people have told me they need but i was not expecting him and i am doing my best. Other than a larger tank, because i dont have the budget for that right now, what can i get him to make him happier?