Wow. It's indeed rare that someone gets an e-mail from one of us and actually cares, let alone replies. But for you to come here and actually ask for advice does show something about your character!! The smaller bowls can be used for bettas, If there is a way to keep tank temps up (usually a heater is used, or sometimes just a warm spot that doesnt get too much flux in temp). I can see the 6 gallon being used for White clouds. http://www.liveaquaria.com/product/prod_Display.cfm?pCatId=950 Again watch for temp fluxuations, but note they can go without a heater.
Unless you find a way to actually filter the tank, maintenence should be daily, or close to it. The suguestion of changing all the water every 4-6 weeks will actually harm the fish, both from an extreme change in water peramiters, and from a dieoff of benificial bacteria. for more info, read here http://www.aquariacentral.com/forums/showthread.php?t=64301
Again, it is nice to see that you actually care, and mabey this will lead you into our wonderful hobby. Please keep us posted if you make any changes to the "fish care guide" and good luck with your sales!
Unless you find a way to actually filter the tank, maintenence should be daily, or close to it. The suguestion of changing all the water every 4-6 weeks will actually harm the fish, both from an extreme change in water peramiters, and from a dieoff of benificial bacteria. for more info, read here http://www.aquariacentral.com/forums/showthread.php?t=64301
Again, it is nice to see that you actually care, and mabey this will lead you into our wonderful hobby. Please keep us posted if you make any changes to the "fish care guide" and good luck with your sales!