Low ph

[Scudd]

I have started to drip Kalk with my auto top-off, but in the mornings I'm noticing the Ph is around 7.7-7.9. Do you think I should be adding some sort of buffer or leave alone? Mid day it hits 8.0 and maybe a high of 8.1. This is a reef tank with SPS and LPS corals. Thanks...

[bach2pilot]

How's everything doing? If your corals are doing well, and your alk and calc are good, I would be hesitant on messing with it. I'm a big proponent of "if it ain't broke - don't fix it".

IMO, ph of 7.7 is a bit low, but mine is routinely 7.8 in the morning. My tank is doing very well (knock on wood).

Have you tried the "easy stuff" - good ventilation, an opposite light cycle in sump, putting your calc reactor effluent upsteam of your protein skimmer?...(I would rather do some small structural changes than start dumping chemicals.)

[snorvich]

Also, be sure you are measuring Ph with a calibrated probe. These babies slip out of calibration frequently.

[Marklu]

If you have a fuge with a plenty of macroalgae, a reverse lighting cycle should probably be enough to keep it at least 7.9-8.0 in the morning.