Well to combine high flow rate with sterilization i recently bought a EHEIM Professionel 350 Elettronic and a Ruwal 20W UV-C sterilizer lamp which can sterilize 97-99% of the organisms in the water with a 1000 l/h water flow(if the flow is lower even better).
The filter powerhead is rated at 1500 l/h alone, with all the materials and pipes load is rated slightly below 1000 l/h which should be more than ok in my RIO 180, this setup looks pretty balanced overall or so i hope.
The reason why i decided to get an UV lamp(and also a better filter than the basic one) is that the water recently became SO foggy that plants started to suffer from low light emissions...
There was no particulate in the water so it must have been excess of bacteria.
Yesterday night i activated the whole thing now i'm waiting for results...hopefully.
I still have the old filter going, I'm not sure how long will it take for the new filter to mature in this situation.
This is the UV-C lamp, they produce it here in Italy so i was able to get it rather cheap if compared to DeBary lamps, they both have stand alone electronic circuitry to turn on the UV-C and the lamp shield is made by quartz as DeBary ones.
Looks like an awesome and affordable product.