no what we were talking about was 10 gallons +. You could fit 1 betta in there, its a lot nicer than bowls and they probably will stretch there fins etc. Or you could have 4 male guppies. Thats pretty much all there is that you can have..... i wouldnt suggest a school of tetras as 6 gallons is a bit too small for them, no tetras below 10 gallons
do you also know the wieght of a 6 gallon tank, there pretty heavy so not all desk spaces can carry them. Its about 70 pounds of water plus the gravel, filter, light, ornaments, your pushing a lot of weight there.