Oh I see what you are saying but I can't see your filter in the pic. You have a beautiful tank but your water sure looks deep. Do you have big frogs? I mean like the size of a softball? LOL I have little guys and maybe I mentioned before are in 3" of water. How do yours climb out? They just paddle around, no diving? Minnows are good in yours because of how much water I'm seeing. If I could post a picture of my tank I would, but no one has shown me how. Oh, your tank is larger, I have a 10 gal at the moment. What I'd like is a 20 gal long one but have not seen one in stores. I'm always checking thrift stores and will have to wait for garage sales. I have screen to make my own cover. My tank does have different levels I built and I'm thinking a tree house would be good, I just have to find one, preferably plastic painted in brown or gray.