I have a ten gallon tank with just a male betta in it. It's heated (80 degrees F) but not filtered (I do weekly 25% water changes). Is there anything else I could put in there? I've been thinking about a snail, but I'm not sure exactly what care they need. I'd prefer not to have to put a filter in, as my betta has a hard time swimming with one in, and ends up getting swept all over the tank. On the topic of filters, are there any filters that DON'T create too strong a current for a betta? Any way that I can make the current stronger? He's doing fine with the water changes (I've had him for about a year and a half and he's never had any sort of disease) but I realize that bettas are pretty much one of the only aquatic critters that can do without filters, and if I add anything else, I'll probably need one. Thanks!