I have the same tank. Beware the natural waterfall kit! I followed the directions and ended up with brown water that turned black that fostered fungus. I am still working on a solution to the brown water issue!
Right now I have 1/4 of the tank with rocks, a divider and the rest with the hydroballs and substrate so there is a pond on one side. I have a 501 Zoomed Filter, but still brown water! (photo attached - before the water turned brown again)
My next bright idea? I am putting in the Trex Foam Log Landing for a 20 gallon aquarium Divider and *Filter between the pond and the other stuff, doing a very deep layer of rock on the opposite side, and am cutting out the coconut fiber altogether. I've not yet decided what I will replace it with, but probably larger coconut fiber pieces that can be better rinsed out. My hope is the rock on the opposite side will be so high that leaching will be far less likely!
If that does not work, I may try a revised version of another post and use a plastic sheet and silicon to make a water-tight seal between the sections. I don't want to do this, as it will be difficult to get that out if I ever want to change the layout again, but we shall see how succesfull my foam log divider idea is! The foam goes in Friday evening.





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