I have one of the very same tanks. I bought it on a whim one day, thinking it wouldn't be a big pain. It's just a small tank. Nothing serious, right?
I now call that tank the death trap. It's too small for pretty much anything. Shrimp might work. The LED lights are not there as moonlighting. That IS the lighting for the tank. The filter it comes with is more of a joke than anything. It's noisy, only has the tiniest of cartridges, and doesn't create enough water movement to actually move any of the debris into it. However, it does add oxygen into the tank so at least that's good.
After spending more time and more money on that "tiny, inexpensive, not a big problem" tank, I decided to save my money, my time and my heartache by getting a 5g Eclipse style tank. Wow, what a difference!
I also don't recommend using it for a betta. Unfortunately, the sides of the tank are so reflective, the poor betta goes nuts all day long seeing its reflection. It's downright cruel.
I finally just gave up on using the tank for anything. I did use it for a couple of days for some guppy fry while I was working on a 2.5g pico planted tank for them. The advantage over a bucket with an airstone is that you can see through it better than you can a bucket.
Obviously, I am not a fan of my little tank!
Consider getting a small 5 gallon tank for your son. He'll appreciate it more in the long run because he can actually enjoy the fish rather than watching them die, and you'll like it better because it would be much less work to maintain. A small 5g tank, a lid, desktop light (that you already have) and a little Red Sea Nano filter would work very well. Put some substrate in, add easy plants (java moss), a tiny piece of driftwood, maybe a rock or two, and you'll have a wonderful little setup. Add snails and Red Cherry Shrimp, and your son will go nuts enjoying the shrimp attacking the pellets when he feeds them and watching them breed.
Just be careful, though. I went from the 1.5g, to four 5g, to a 20g long, to a 29g and then a 75g. Amazing how the tanks grow as fast as the shrimp!