Haha pretty cool way to use those planters. I was expecting you were going to half plants suspended half way up the glass.
One issue though, in both pictures I see the goldfish really close to the surface. Something might be wrong with the water as they usually prefer to hang around in the middle. What filter are you using? I read on this forum that goldfish need wayyy overpowered filters to handle all their crap. You'd probabily need a 10g HOB filter for that 4g, maybe even more. At least that will cut down on your water changes though. Also, using purigen > carbon if possible.