Im obviously new to this site but it seems friendly and helpful. Apparently I've had a nano tank for quite a few years now and never knew it. Ive never even heard the term nano tank before today and didnt really know what it is. I currently have a 20g long tank. I have a mixture of live and dead rock a few inches of aragonite substrate with a few handfuls of crushed coral thrown in. I have a yellow tail damsel, a green file fish and a goby or blenny (forgive me I cant remember what he is ) I have one tiny nassarius snail. I think my blue legged crabs have dissappeared and I havent seen my sandsifting star in about a week. I would love to improve my lighting as I have a standard hood that came with the tank and maybe add some more LR. I know I cant put more fish in it but would eventually like to get different fish. I had a hawaiin feather duster but had to return him because the filefish kept trying to eat him. Anyway I hope to meet more of you and learn more about nano's. Im also thinking about setting up another smaller tank. Is it possible to take say a 5g and put LR and maybe some mushrooms or something in it?