Fluval 207 might be too little flow, its only 780lph. You should be looking for a 407.
If you go to George Farmer's youtube channel and check out his Aquascaper 600 setups (99 litre high tech), he uses a Biomaster 600 which is 1250l/hr. The youtube video above shows the typical amount of flow in his tanks. Do note that if you have a lot of hardscape blocking flow, you may still need supplementary pumps to avoid dead spots.