I don't have a dwarf puffer, but I did a ton of research about them because I was planning to get some (I ended up getting bettas, lol). I wouldn't say they are much different from other fish, but they do require some special care. If I remember correctly, the minumum size for one is 5 gallons. They can be kept with other DPs, but the tank must be heavily planted and a fairly large size (basically like keeping a female betta sorority). They also produce a lot of waist, so the tank must have high filtration. Also, DP are not a community fish and should be kept in species-only tanks, sometimes with docile bottom feeders. DP prefer to eat frozen of live foods.