0.4 pH swing...bad?
 

With my new Pinpoint pH monitor, I've just learned that my tank swings from 8.08 before the lights turn on to 8.51 when the lights go out. Is this daily pH swing stressing my animals and corals? I know they haven't looked the greatest lately, but nothing has died, everybody's eating and my corals are still growing...slowly.

I drip kalk when the lights are out at about 2 drops per second. The drip stops when the lights turn on.

What's an average pH swing in a healthy tank? Thanks in advance :)

Son of a .... lol
Sorry I couldn't help it :wink:
Anyways my tank reads 7.09 to 8.10 in the night, and during the day the swing stops at 8.20 to 8.34 reading with my Pinpoint Monitor as well.


:D Rich

Mine swings from 8.00 lately to 8.15...

hey mason,
got your alk problem worked out?

I wouldn't say I got the alk problem worked out, but I have it under control. With a combo of 2 part supplements and kalk I've got my alk pretty stable, but I have to test it at least once every 2 days and make adjustments. Thanks for the tips on kalk btw, it helped out alot.

Now my concern is with pH since my pH swing seems pretty large. On some days it swings from about 8.1 to 8.5.

Thanks.

7.09 Rich, :shock: I assume thats a typo.

SS, that seems like a pretty large swing. My barely moves but under different methods. My friends 120, which is kalk dosed, seldom gets below 8.2 @ night and up to 8.4 @ day. Mine, {sump running, :) }, is around 8.25 @ night and 8.4 @ day.

I guess it is a big swing, but would you say it's too much of a swing?

I dont think its somethin to worry to much about. I would be curious why such a large swing though.

The night reading seems closer to normal, but thats a big climb in the day. Do you dose in the day as well?

Thanks Doug. I'm currently not dripping kalk when the tank lights are on. I won't worry too much about it then.

I would think the kalk is binding up the CO2 at night and then during the day photosynthesis further depletes the CO2 thus causing an even higher pH. I would recommend increasing the gas exchange in your tank. If your pH goes much higher than 8.55 - 8.6 you will start to lose corals.

Cheers,
Tim