So I have a 55 gallon that has been up for about 12 weeks now. And I have a female 4 inch Green terror, and 4 2 inch long giant danios. The green terror does not mess with the Giant danios, whatsoever. I also wanted to get a species of bottom feeder, (preferably catfish) that don't get too big, but will also have armor. My gravel is medium, and is smooth. The reason I want to get a bottom feeder is because the 5 fish I have are messy eaters, and they will always leave pieces of food at the bottom. I wanted to get something that will pick up the pieces of food, and eat it. https://www.youtube.com/watch?v=Dv-Q0nSLdMI here is a video of this week. It is the most recent so you guys can see what the tank looks like right now. Or I would like to get another cichlid (convict, firemouth, or something small)