Reef Crystals & Instant Ocean -- Extremely Low PH

[NeptunesGhost]

Minh,

I'm sorry, but I do this all the time. My nano gets a change of about 50-60% regularly - and there are a pair of clowns, a blenny and a RTBA, along with some other critters. Usually gets mixed for a hour or 2.

Frankly, I use large quantities (over 25%) of newly mixed salt all the time. I make sure it's clear, and that it's been decent oxygenated.

Out of curiosity, how do you check oxygenation? As I said, I may be over-oxygenating.

[OrionN]

I know that if I change 100% of the water, I used aged (1 day) water and have no problem. The one time that I changed 75% of the water using fresh mix water, my coral all stressed out and a few mortality resulted, including fish. Everything was disolved and the water was clear and well oxygenated. I did not try to use freshly mixed water after this event.
There are plenty of reading material over at the Chemistry forumn at Reef Central on this topic.

[OrionN]

Open container with something to aerated the water would be sufficient to assure well oxygenated. I don't think you need to worry about over Oxygenation (unless you use 100% oxygen). I don't think you need to check the oxygen level

[NeptunesGhost]

I ask because low oxygen in water causes low PH correct? The PH of my freshly mixed and aged water is 8.8 using PH 7.0 RODI (0tds) water. I have Red Sea working on that too.

Sorry, didn't mean to hijack, just trying to clear things up.

[OrionN]

pH is more of a function of CO2 in water rather than O2 (and other dissolved acid and base) CO2 dissolved in water to form H2CO3 = H+ and HCO3-. Agitated water will make sure that all the CO2 escape to the atmosphere.
Sorry for all the misspell words. I was in a huge hurry this afternoon.

[wesheltonj]

When I first started, I waited 48 hours, then that went to 24, now its 12. I mix it the night before, place in 1 or 2 Maxi-jet 900's depending how much water I am mixing up (I use to use 1200's, but the 900's have a much smaller power draw and I am just mixing water). I have use fresh mixed water in as little as 15 minutes, but only like 10% of tank volume.

[DrMark]

I try to mix water night before, but often is just several hours before change, no air stone, just a strong pump. I am only changing about 15% volume though.
mark

[Agent Jones]

i try to mix a day in advance and that seem to help alot