minimum 5g's each you can stock as 5g for the first and 3g for each of the next ones if you keep the ratio either all females or 2 females for ever 1 male you can go to dwarfpuffers.com for sexing tips. They enjoy heavily planted tanks but plastic plants are totally fine, must have a visually complex environment because they are smart and will spend most of their day exploring their tank. They don't need snails to trim their teeth but they still appreciate hunting them and if you gut load them they can help keep your puffers healthier! Blood worms, mysis shrimp, brine shrimp + snails. Generally not advised to keep in a community tank because as with other puffers the general trend is for them to get more aggressive as they age. 50% wc's a week and keep an eye out for bullying and nipped fins as it is added stress for the puffer and you may need to separate the aggressor.