Effect of high alkalinity on marine fish

[Gray Levison]

Hi, I was just wondering what effect high alkalinity (around 12-15) could have on fish and inverts. I'm aware how it effects corals but can't seem to find anywhere discussing its effects on fish.

 

[Randy Holmes-Farley Verified Community Expert]

I've not really heard of any effect, but that doesn't mean there isn't any.

In Captive Seawater Fishes, Steven Spotte has a few dozen entries in the index on alkalinity and its importance in a fish aquarium and its effects of various sorts, and none suggest a clear impact on fish, aside from indirect effects such as pH, etc.