Freshwater

For tanks of ≤ 90 cm

Difficulty: medium

Fits: FZN-2

For tanks of ≤ 100 cm

15 ml

Difficulty: easy

Fits: FZN-3

For tanks of ≤ 120 cm

15 ml

Difficulty: easy

Fits: Ultramax, Maxikani

For tanks of 45–55 cm

For tanks of < 250 l

Difficulty: easy

For tanks of 60–70 cm

For tanks of > 250 l

Difficulty: easy