FOWLR

FOWLR stands for Fish Only With Live Rock. It’s a saltwater aquarium with no corals.

The Aqua Care Guide™ gives FOWLR tanks their own parameter table, and says those values are for FOWLR aquariums only.

Why It’s Important

It decides which salt and targets you follow. FOWLR Macro Probiotic Salt™ is made for these tanks.
That salt provides high calcium, alkalinity, magnesium and potassium relative to specific gravity, which the Guide says helps pH and KH stability.
It also supplies the major, minor and trace elements, with the aim of fish health and vitality.

The Guide’s FOWLR targets at 25°C (77°F) change with specific gravity:

S.G. 1.019: calcium 350 ppm, alkalinity 8.4 dKH, magnesium 1,080 ppm, potassium 300 ppm
S.G. 1.022: calcium 410 ppm, alkalinity 9.8 dKH, magnesium 1,260 ppm, potassium 350 ppm
S.G. 1.025: calcium 470 ppm, alkalinity 11.2 dKH, magnesium 1,450 ppm, potassium 410 ppm

A FOWLR tank still depends on live rock, a good salt mix and steady specific gravity. The manufacturer describes its FOWLR salt as a hybrid of natural seawater and synthetic salt.

FOWLR is a fish-only tank with live rock and no corals, and it follows its own targets. Compare the salts in the environmental salts collection.