Water change?
to Mr. Fenner,
How are you Robert?
<Very well my friend, thank you>
 I have a quick question. I have been recently bringing down a high nitrate environment. I have a 180 gal tank and have been doing about 40 gallons at a time. When I did my last water change everything in my tank stopped moving and shriveled. I use tap water with declorenease. It sits with a large power head overnight. 
<Hmm, a dangerous protocol... Please read through the "Seawater Use" section on our site: www.WetWebMedia.com and you will find I encourage a good week of mixing, waiting ahead of such new water use...>
When I had checked my salinity the first time they were both the same. Afterwards I realized that the hydrometer was broken. My new readings are 1.022, nitrates are at 40, nitrites are 0, and ammonia is 0, ph is 8.4. I believe that the salinity may have been off now, The clams have folded in on themselves but are still alive. some of the snails died but seem to be coming out of shock. All of the corals are wilted and shrunken in. The zooanthids are closed. They all secreted some sort of slime, I am assuming as a protection. 
<yes, likely... and maybe from chemicals in the new synthetic in addition to or instead of a difference in spg...>
My question what to you does it sound like I did wrong. And will my corals and clams survive? Desperately needing advice,
Ryan Alexaki
<All will likely be fine... Do look into reducing your nitrates in other ways other than dilution ("Nitrates" FAQs on the WWM site), use of "Macro Algae" and perhaps more live rock... a deep sand bed, maybe a plenum set-up in an attached sump... and do develop a solid routine of pre-making your seawater (with a marked volume in the tub, and a container of about the right volume for the sea salt... to get the spg about right, and let aerate, heat for a good week ahead of use. Bob Fenner>

Algal blooms with water changes
Hi Bob
Hope you are doing well these day's. I have a question about my water changes. I make up my water about 7 day's before I do the initial change. My salinity is a steady 1023.Every time I do my water change, I seem to get an alga bloom. All of my readings are, calcium 450, alk 11dkh,ph8.3, no nitrate or phos. detectable. Do you know what is causing this??
<Possibly silicates (SiO2)... or other "rate limiting" material in the source water...>
I don't have a algae problem until I change the water, hope you can help, everything in my tank looks great. As always ,thank you very much.
<Look into an inexpensive reverse osmosis unit. One with a "carbon" contactor filter in its flow path. Bob Fenner>

Water changes (mal-affects causes)
Hi Bob,
A quick input if you will...what's wrong with my fish after water change???
My yellow tang swims around in circles & gets dizzy looking. A couple of water changes ago, I lost a damsel; so I'm wondering what's killing my fish or almost killing my fish. I change 5 gallons a wk & 10 gallons during any major tank clean of my 55 gallon. So, what's affecting my fish the most?
The temp of my new water?? The salinity of new water?? Low oxygen of new water?? or just changing out to much water. All of the above! I do match the new water with tank water pretty good, I think...I guess what I'm trying to ask, what are fish most sensitive to during water change??
thanks,
Lee Harris
Dallas, TX
<Very good question... and "who knows?"... perhaps all the above. My ongoing advice can be found under "Seawater"... on the WWM site... pre-mix and store it... Bob Fenner>

Water change bubbles
Bob,
Once again, I turn to the master. In trying to raise the PH which was just slightly low, I did my first water change in my new tank (live sand only, so far-LR tomorrow). I got a bazillion fine bubbles in the tank. They were just flowing out of the Bak Pak 2 water return in a cloud. I put filter floss over the opening of the return pipe but it didn't help much so I turned off the air to the skimmer. surely this isn't normal. What am I doing wrong?
<Likely not much... maybe some hygroscopic particles came in with the water change... and your system is new (and will become less "bubbly" with age)... but the Bak Paks do have this propensity... You might want to rig up a "dump area" like a hang on device in the tank... with more material (bioballs, Dacron...) to dissipate these for now... Bob Fenner>
I hope by now you have recovered from your "working" vacation but, I have found with age, it takes a "few hours" longer.
<Wowzah, been back for two weeks and am way past due for getting out again!>
Thanks for the help.
Thom Walters

Chloramine Deaths.
Hi There,
<cheers!>
Recently, I've had deaths in my tanks directly after partial water changes that must have been chloramine-related. 
<Not likely... more commonly a discrepancy in temperature or pH. Do you really have so much Chloramine that you can smell it from feet away? Most dechlorinators easily neutralize this treatment>
I unfortunately used a "one-step" product for my water changes that I will never use again.
<do reconsider that most every Dechlor product is virtually identical in efficacy>
A friend told me about your site. I'm glad he did! I've did a good deal of reading of your site. I'm intrigued about your "vat method," -- letting water sit or be mixed for a week or more before being added.
<chlorine will dissipate in open air but chloramine never will... a chemical bond that must be broken (with a de-Ammoniating product.. most conditioners)>
My question is, what will this method do, if anything, to "toxic metals?" 
<absolutely nothing>
Should I be concerned about this?
<hmmm... rare in potable tap water. If concerned, get a prefilter stuffed with PolyFilter pads to draw water through>
Thanks! Walter B. Klockers Plano, TX
<best regards, Anthony Calfo>

Top-Off Water pH Problems
Sorry to bother you with another question again so soon, but I am at a loss as to what to do about my top-off water's pH.
<No problem.>
I purchase RO water from my LFS. I've tried Kent's Osmo-Prep as well as Seachem's Marine Buffer, but what keeps happening is that the pH is fine as soon as I add it to the RO water, but by the next day the water is highly acidic and below my pH test scale. I aerate the water as soon as I bring it home and keep it aerated as I use it throughout the week, but it will not maintain an acceptable pH. What I'm trying to do is have freshwater constantly aerated and pH adjusted so that I can just pour it in the tank once or twice a day to make up for evaporation. Can you recommend a way to do this? Or do I need to pH adjust the top-off water each and every time I add it?
<You should not need to keep adding buffers everyday. Perhaps you are just testing too quickly and the RO water has not had enough time to mix with your buffers. I use Seachem Reef Builder and Marine Buffer, about 1/2 teaspoon of each for every five gallons, and have not had a problem.>
Thanks so much again for your assistance! Karen
<You are welcome. -Steven Pro>

Water Change & pH Problems
Dear Mr. Fenner,
I have recently diluted my 100 gallon tank from 1.024 to 1.022 during a water change and observed a drop in PH from 8.2 to 7.9. I have checked the water quality from Ammonia, Nitrite and Nitrate, almost zero concentration. Water buffer is still high. However, the PH remains below 8.0. What should I do? Change more water?
<Usually the best move. I would first double check the pH and alkalinity of the new water to ensure it is in the proper range. Please search through WWM regarding saltwater mixing issues.>
Best regards! I-Ching Liao
<You are welcome. -Steven Pro>

Re: Ammonia
Bob, <<Not Bob, JasonC here...>> I believe I may have found the source of my ammonia problem. <<ok>> I vacuum the substrate surface ever time I do a water change every week (approx.. 13% removal) and my ammonia was still traceable. The tank has been running for 2 years, I have never had this problem before. I clean all of my filters every week. What the problem was is that I was not vacuuming deep enough, the tank has a 1-1/2" s deep sand bed and I realize that the fish waste and other junk was not just on the surface, but deeper in the sand bed. How often should you move around LR? <<Whenever the mood strikes. If I were you, I'd look into perhaps some more or larger powerheads in the tank so that some of this detritus makes its way into your filters and not into the sandbed. Constant vacuuming of the sand bed will disrupt the ability to produce/harbor beneficial organisms like copepods and the like that would normally deal with the detritus for you.>>
Thanks
<<Cheers, J -- >>