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Old 05/16/2018, 03:18 PM   #1
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Join Date: Feb 2016
Location: England, Earl Shilton
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Low alk and fish

Hello I have just tested my alk in my system and it's 5.4ppm would this low reading affect fish negatively especially wrasses? I have no corals in this tank.

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Old 05/16/2018, 04:10 PM   #2
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Alk doesnít effect fish. No reason to even test for it if you donít have corals. For fish only systems I would only monitor salinity and temp.

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Old 05/16/2018, 09:38 PM   #3
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I agree that the fish won't care about the alkalinity itself. If the alkalinity drops to a very low level, the pH might become an issue, at least in theory. I might check the pH.

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Old 05/17/2018, 10:58 AM   #4
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You can easily bring the value up with a little baking soda, by the way.


Current Tank Info: 125 in-wall , 40b sump. 6 bulb T5. ASM G2 skimmer. LPS and leathers
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Old 05/17/2018, 11:53 AM   #5
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From what I've read, having low alkalinity can make your tank more prone to large pH swings. The fish might not care about the alkalinity in itself, but I don't think large swings in pH are good for fish.

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