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чувствовать себя как рыба в воде stresses
gen.	feel quite at home (Anglophile); take to like a duck to water; be in one's element
Игорь Миг	be at home with
inf.	it's the water one has always swum in (lubash13)
Makarov.	feel in element; be in one's element
slang	know the shit (bigmaxus)

чувствовать себя как рыба в воде: 5 phrases in 4 subjects

General	1
Idiomatic	1
Makarov	1
Psychology	2