Water quality is a decisive factor for a well-running aquascape or planted tank. Thus it is vital to find a suitably-dimensioned filtering system for an aquarium.
The filtering system removes noxious substances from the water and turns them into important nutrients.
Please abstain from using an internal filter in an aquascape. It will considerably infringe your freedom to decorate the tank. The far better choice would be a high-performance external canister filter.
A sufficiently strong current distributes the nutrients and CO2 in your tank in the best possible way. Moreover, the water movement on the surface helps oxygen diffuse into the water. The high-quality Superjet Filters by Aqua Design Amano (ADA) are especially well-suited for aquascapes due to their really nice design.