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Old 01-04-2013, 05:17 PM   #11
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If you look closely at the rock you will see the weird bubbles I was talking about. Periodically the release bring bits of the sandbed with to the surface.
The bubbles are probably oxygen being created by photosynthesis. I have a couple of different strains of hair algae that act like this as well.
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Old 01-04-2013, 05:31 PM   #12
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Kalkwasser is only really effective as Calcium/Alkalinity maintenance in reef that are moderately stocked with stony corals. While Kalk is cheap, it's best used as part of an auto top off or slow drip. Fully saturated kalk has a pH of about 10.5 so adding too much too fast to try to raise Ca/Alk can open the door to a pH spike which will also cause calcium carbonate (what you're trying to add) to precipitate out.

I would avoid purple up & dose 2 part to raise your levels then kalk would be acceptable to maintain them.
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Old 01-04-2013, 05:34 PM   #13
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Thanks again guys, definitely eased eased some of my worries
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Old 01-04-2013, 05:34 PM   #14
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Kalkwasser is only really effective as Calcium/Alkalinity maintenance in reef that are moderately stocked with stony corals. While Kalk is cheap, it's best used as part of an auto top off or slow drip. Fully saturated kalk has a pH of about 10.5 so adding too much too fast to try to raise Ca/Alk can open the door to a pH spike which will also cause calcium carbonate (what you're trying to add) to precipitate out.

I would avoid purple up & dose 2 part to raise your levels then kalk would be acceptable to maintain them.
The opposite is true. Kalkwasser will raise the levels (although it must be added very slowly because of the PH issues raised. At night is the best time.) then a two part does a good job of maintaining them. You can use calcium chloride to boost calcium levels, but I like Kalkwasser better, Again, Google "Kalkwasser use" to form your own opinion.

This is a good thread,

http://www.bostonreefers.org/forums/...o-part-as-well
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Old 01-04-2013, 06:17 PM   #15
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Kalkwasser is only really effective as Calcium/Alkalinity maintenance in reef that are moderately stocked with stony corals. While Kalk is cheap, it's best used as part of an auto top off or slow drip. Fully saturated kalk has a pH of about 10.5 so adding too much too fast to try to raise Ca/Alk can open the door to a pH spike which will also cause calcium carbonate (what you're trying to add) to precipitate out.

I would avoid purple up & dose 2 part to raise your levels then kalk would be acceptable to maintain them.
Ya i agree here kalk is more for maintaining levels but i imagine that if you dont have many sps it could be used to raise levels in my 55g sps only kalk couldn keep up i had get calcium reactor so id imagine stock of the tank would determine its effectiveness i think the brown algae is dinoflagilates
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Old 01-04-2013, 06:40 PM   #16
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I dose kalk on ATO @ 2/3 saturated solution. This keeps my calcium @ 440ppm @ Alk @ 11.5. Even in 140 gals of water, that's enough to raise my pH .25 with less than 1 gal going in over a 24 hour period. I would not use kalk to raise my calcium or alkalinity EVER. 2 part allows you to raise calcium by up to 20ppm daily & alkalinity 1dKH daily without a significant rise in pH. For me to raise my calcium by 20ppm in a day, I would have to DOUBLE my dose, sending my pH through the ROOF.

Yes, a lower demand tank would require less, resulting in a lower pH swing and yes, vinegar can be added to help offset the pH swing, but why not use a solution WITHOUT the negative side effects?

As a maintenance dose, the 24/7 addition of both calcium & alkalinity (can't do this with 2 part they have to be dosed separately) and convenience of dosing via an established system (ATO) far outweighs the pH swings. Further, the lower quantity needed for maintenance v. raising keeps that swing lower anyways.
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Old 01-04-2013, 07:29 PM   #17
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Kalkwasser is the cheapest and most efficient way to go. You can maintain calcium levels with two part solutions and purple up, but it takes Kalkwasser to raise them to the right levels. Also a good salt mix will help as some of them have high calcium levels when mixed. Kalkwasser is cheap.
I also somewhat disagree. You definitely can't maintain calcium using Purple up, unless your demand is next to nothing, plus Purple up does nothing for alk. It's best to use 2-part calcium and alk dosing to get your levels where you want them, especially since you may need to adjust one more than the other. Then use kalk to maintain those levels, if your demand is low enough where the kalk will keep up.

What Your Grandmother Never Told You About Lime by Randy Holmes-Farley - Reefkeeping.com
"Limewater that is saturated with calcium hydroxide has a pH of 12.54 at 25ºC. It is actually recognized as a secondary pH standard. ...Saturated limewater has a conductivity of about 10.3 mS/cm at 25ºC, and contains about 808 ppm of calcium and 40.8 meq/l of alkalinity."

"The fact that limewater is very basic (the pH is typically above 12) demands that the limewater be added slowly to an aquarium unless very small additions are made. The reason for this is two-fold: to prevent the local pH in the area of the addition from rising too high (slow addition permits more rapid mixing with tank water to reduce the pH), and to prevent the overall tank pH from rising too high (slow addition allows the tank to pull in CO2 from the atmosphere during the slow addition, mitigating the pH rise). Some aquarists advocate rapid addition, and that is fine for small additions that would add less than 0.2 meq/L of alkalinity to the aquarium, but larger additions will drive the pH too high..."

"Another important consideration for limewater is the upper limit of the amount that can be added to an aquarium. This limitation exists simply because both the amount of water that can be added to an aquarium each day (to replace evaporation), and the amount of solid lime that can be dissolved in that water, are finite."

"If an aquarium’s calcium and alkalinity demands are near the high end, then replacing all of the evaporated water with saturated limewater may not be adequate. ... Additionally, aquarists often use a small amount of one of the other balanced additive systems (especially the two-part additive systems) to give a little boost to aquaria that need a small amount of extra calcium and alkalinity beyond what limewater can supply, without incurring significant capital costs. Likewise, these two-part additive systems can be successfully combined with limewater during periods of low evaporation when limewater may be temporarily limited and not meet demand (as during rainy cool weather).."
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Old 01-04-2013, 07:33 PM   #18
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Aquariums for decades have been successfully run with just Kalkwasser addition. Add whatever you want to add.
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Old 01-04-2013, 07:51 PM   #19
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Also of note, kalk can cause magnesium levels to drop. It can also cause a little phosphate drop. One is good, one is bad.

A myth is that kalk loses potency when exposed to air. While it does occur on a minor scale, it won't have noticeable impact on your dosing. I mix a months supply at a time. I never stir it after mixing either.

But yeah, skip the Purple Up. It won't help much if at all.
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