Freshwater

Difficulty: easy

For tanks of 1–800 l

For tanks of ≤ 600 l

Difficulty: medium

For tanks of 10–300 l

Difficulty: easy

For tanks of < 30 l

For tanks of 60–120 l

Difficulty: easy

For tanks of 100–150 l

For tanks of ≤ 200 l

Difficulty: easy

For tanks of 150–250 l

For tanks of ≤ 350 l

Difficulty: easy

For tanks of 10–40 l

For tanks of ≤ 200 l

Difficulty: medium