Many years ago, Connie wanted to have a swimming pool put in, so I made a deal with her that for every sale of her leopard geckos, she could take the money and put it towards the pool. She called it her "folding" money. Well, she did pretty good with the leopard geckos, and quickly had enough money for the pool. So we had a small in-ground pool put in with a concrete patio around it. Here in Florida there is some kind of law whereby all swimming pools must have some sort of fence or screened enclosure around it. But for the first year we did without.
That was back in the days when we were working our butts off with that SerpenCo business, and we found that the ONLY way we could find time to use the swimming pool was late at night when we were finished with the animal chores. So around midnight or so when we closed down the animal buildings and headed over to the house, we would go out to the pool for a little dip, and found the pool ringed with tree frogs. And they were all just singing up a storm. In short order I was able to mimic their calls, so I had them all worked up into a ruckus trying to outdo my calls. One of them got into the overflow pipe and found out that it greatly amplified his call, so he was a tough one to beat. Most of them were greens but every now and again some larger greys would show up.
Eventually we did put a screen enclosure around the pool, and honestly I do miss the tree frogs. Without the water source, you would never know there were that many tree frogs around here. Well, except every Thursday evening when we get the trash ready to take out to the road, there will often be three tree frogs in the WastePro trash can that we have to get out of there first. Can't see throwing away perfectly good tree frogs!
We've toyed with the idea of putting in a pond, but my concern would be that we might be creating a mosquito breeding pool. So yeah, you do have to be concerned with unintended consequences whenever you change something in nature. And hindsight can be a harsh instructor.