what youre talking about is called a Nano reef tank. I have 2 of them right now and if youre new to saltwater these are what you want to avoid. You can keep 1 clown fish in a 10g but thats it and you need constant testing of your water parameters since such a small volume of water can easily take a turn for the worse and ruin the whole tank. Im not saying to give up on the idea just saying you have to be vigilant about it and its not something a little kid could take care of.
I never thought you would, but always knew you could.