Hi Ziege,
1) activated carbon takes out everything! good or bad.
2) forget the ammonia stone....forget miracle stone no short cut for water chemistry except good husbandry.
3) use ehiem substrate pro or biohomme.
2 trays,
1 tray for bigger materials, ceramic rings( go for sintered glass )or biohomme.
next tray smaller materials like ehiem substrate pro, these manner they act as a mechanical filter also.
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