Is additional bio-filtration needed or even desirable?
For the purposes of this thread, please assume the following characteristics of the aquarium:
1.) Good water flow within the tank;
2.) Surface skimming and good gas exchange;
3.) Good substrate like ADA Aqua Soil;
4.) Iwagumi-style aquascape and plant load;
5.) Low to moderate fish/invert bio load;
6.) EI dosing with 50% weekly water changes;
Given the above aquarium characteristics, is additional biological filtration necessary, or even desired? Won't the substrate and rocks be colonized with bacteria to convert ammonia to nitrite and nitrite to nitrate?
Sorry if this is a crazy question. I have combed the archives and read several threads on this topic, but most seem to somehow devolve into a debate over a filtered versus filterless aquarium, which is very different from the question that I put before you now.
Thank you in advance for your input.