Hi everyone! As you can tell, I am new here, and I actually just found this site. I have a 5 gallon fish tank (NOT MUCH AT ALL) that had some small guppies in it. Well, One of my guppies died and was stuck on the filter, so i turned off my filter and took out the fish, then plugged the filter back in and all this bad stuff shot out, like a bunch of random I would say dirt or something, and then the water started foaming, then all my guppies died. I guess maybe it was because the filter hasn't been changed for awhile, and that maybe next time I should add water to the filter once I plug it back in. Well anyway, I have cleaned my tank and now I am looking to see what kinds or kind of fish I should put in my tank? Maybe one Betta? As I hear you should only have a limited amount of fish in a 5gal tank. Sorry for my long story, but this is my purpose for being here, and to meet other people who know a lot about this stuff, and for me to learn all this stuff and eventually get enough funds for a bigger tank!