Just needs water and water conditioner coms with a little bit of gravel fits the small tank but fits a quarter of the big tank fish food has vitamin c and omega 3 for salt and freash water fish fill the tank make sure that your tank is not full of water your fish often goes up and takes a breath of air if you have a beta fish in the tank I suggest that you don’t open the lights it is very bright and betta fish don’t like that that’s is all and before you buy a fish or eny tank watch YouTube videos or do some research about what fish you want to get and check the size recommended this one is 3.5 gallons for your fish