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#1
08-30-2018, 07:52 PM
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Unfortunately in my large tank 75 gallon (set up for 3 years) alkalinity, calcium, phosphate and nitrates are incredibly variable and change quickly. When they change quickly my sps go into stress real fast. I have to test alkalinity and phosphate daily. Today my alkalinity could be 7.5 and tomorrow it could be 9.0. I have to add nitrates to both balance the phosphates in the tank and to keep the corals from loosing colour. I have to monitor these numbers to keep things balanced. I just want to make sure that what I am testing is actually what it really is. I have a 35 gallon reef tank that has corals in it (LPS, SPS and zoas), has been set up for 15 years and now never has issues. I only test alkalinity and calcium once a month to make sure the amount of 2 part I add is correct. I rarely do water changes and the corals are doing great. I take out (sell) about 2 pounds of frogspawn a month from this tank. I test for nitrates and phosphates about once every 6 months and it is always exactly the same. .02 phosphates and 2.0 nitrates. Every tank is different, this hobby is not a 1 system works for all and my tanks are the perfect example. Not really doing anything different in my tanks, feed the same equal number of corals and fish inch per gallon, same corals. 
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#2
08-30-2018, 08:19 PM
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I have so much to say but so little time. Let's discuss at Macna.
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#4
08-31-2018, 12:45 AM
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Glen, are you running dosers on your 75g?
Mine never fluctuates like yours, but I don't bother to test daily. I test weekly and adjust my timers accordingly and this keeps things stable.
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#5
08-31-2018, 03:16 AM
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#6
08-31-2018, 03:24 AM
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Hmm. I'd get away from adding kalkwasser in conjunction with your ato, and I'd probably stop the kalk altogether. You don't need it. I've never used it.
It's too aggressive and hard on pumps. This may be why your alk is swinging, because it's tied into your ato, which is not consistent. Separate your ato from everything, remove the kalk, and start testing daily for Alk and Ca. Then you'll see some stabiblity and can move forward with your 2-part additives. I bet you see stability and your dosing will balance out. Then set up your doser and you'll be much happier with weekly testing.
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#7
08-31-2018, 03:29 AM
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Oh, and don't worry about the results you got back from ATI.
As long as you're close to the proper results with your kits, as I see you were, it's not worth worrying about. Your kits are doing just fine. I think your Kalk addition is what's stressing out your corals as your ATO will fluctuate, so then will your Alk.
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#8
08-31-2018, 05:16 AM
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I added the Kalk to help stabilize the phosphate. I didn't want to have to get too aggressive with the GFO. I have added Kalk before without too much problem.
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