I'm *still* waiting for my nano hob filter to come in the mail. I would like to build a filter for the tank in the meantime. I have used sponge filters in the past and I really like them so that is what I was thinking I would do. But then I saw a video with a small jar built with the same technique as a sponge filter but it had biological filtration with gravel (or whatever) polyfil, and sponge. Now I'm thinking that would be great. BUT my jar is only 2 gallons and it has a pretty large piece of driftwood in it. I don't think I'll have room for a small mason jar. Can anyone suggest something for me to use? Maybe something taller and more narrow? Just in case (because I know you're all going to ask...) I'm only putting a few cherry red shrimp in there Just company for me while I work. Or should I make a fish bowl filter with pothos like Joey did in his video? I'm hoping to use pothos on my big tank too.