hi all im planing on getting a betta as my first fish ive got my tank almost ready it has warter and warter conditioner, ceramic media and i will be buying a heater for it today and maybe some silk plants or somthing let it sit like that for a further few days then go looking for the rite betta! however im still not going to get my betta till im fully satisfied that i know enough to look after it i been reading up on them abit on this forum but have not come across if they are salt warter fish or if not could they live in salt warter? im guessing they obviously are being a tropical fish but can they live in normal warter? 
I use it in my 30 gal and it's excellent. Have you cycled your filter for at least a month? Or did you take the ceramics from another mature filter ( known as cloning, that's my preferred method of setting up a filter )