Thwt pic was when i first set it up. I had the same concern and moved the white clouds upstairs to my 90 shortly after that pic was taken. It currently has 2 danios only. The 2 white clouds will be going back in for the winter since they like cool temps and are better suited to the size of the tank. The danios will go upstairs to my 90g so they don't have it so bad don't worry. The tank is in my garage, the fish get a 50 percent water change with dehumidifier water almost daily. I use a drill pump for water changes so it's super easy, takes me 1 min to do a wc literally.