We just hit the mark for zero ferts, not even potassium anymore... 'just add fish turds and country well water before it gets to the softner.
I have not seen this point of NON FERT usage yet.
Usually we do potassium for yellowing here and there.
Two Eheim 2217 spraybars from 2 canisters on right.
Nothing but Blue Eheim factory foam discs running top to bottom for canister media (no rock bio media, none).
Ehiem 350 skimmer under centerbrace in shadows keeps the film down.
Gobies everywhere, old amano shrimp still alive, and freshwater pipefish still alive.
-nature in a glass.