I have a 29 gallon tank with 1 goldfish. I changed out my filter media probably about a month or so ago. I was using the standard store filter media that comes with the filters. I changed it out, threw that away, and now I'm using Black coarse sponges, aqua clear sponges and ceremic media in a bag. I take the aqua clear, media bad and 1 course black sponge out and rinse it off every water change. I've been noticing that after about 5 or 6 days after rinsing and doing water changes, my media keeps buldging out. I shove everything down in my filter, but it seems like it keeps rising to the top. Does anyone else have this issue? How do I fix it? My filter isn't packed packed per say so I know it's not overcrowded at all. Here's a picture attached of what I'm talking about. Normally they are way down in there and not that close to the top, but after about 5-6 days it always pushes to the top.