Neons, Mollies, black skirts, Phantoms, Zebra Danios, Guppies, Dwarf Gouramis, Plateys, all good community fish that will live together with few problems. I find Neons to be a favourite of most children because of their vibrant colours. Stay away from cichlids, Angel fish and any of the other types of Gouramis-they're generally all aggressive to smaller fish. Some shark breeds can be ok-red-tailed black sharks are good bottom feeding scavengers and can be kept alone, but Iridescent sharks, for example, cannot be kept alone, they'll literally die of loneliness and Bala sharks can be aggressive towards other fish. After a couple weeks of having your tank full of fish and all set up, you can introduce a Chinese algae eater or a Plecostomus, but beware, plecostomus are one of the few fish that will grow beyond what can reasonably fit in your tank-they'll just keep growing and growing...Chinese algae eaters are better in this regard, but are (ironically), less adept at keeping your tank clean by eating algae, plus, both breeds can occasionally be aggressive towards other fish. But it's worth having one to keep the algae down (the fish couldn't care less about algae, it doesn't harm them in any way, but it makes the tank look less impressive and if left to it's own devices, will make it almost impossible to see in the tank). At the same time you introduce the algae eater, you should also get a catfish or bottom feeding shark of some type. They eat the food you put in the tank that doesn't get eaten by the rest of the fish. Corydoras are pretty much the norm for this role.
Make sure you have real plants in your tank, they help to make a more natural environment for the fish (not just appearance, they help keep the water balanced).
There's tons more info about this hobby so If you have any questions, feel free to PM me.
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