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Calcium level

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Calcium level

Postby saltydog » Thu 12 Jul, 2018 10:59 pm

Who runs calcium closer to 300 ppm?

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Re: Calcium level

Postby TbyZ » Sat 21 Jul, 2018 12:32 pm

saltydog wrote:Who runs calcium closer to 300 ppm?

Chris

I've recently come across a Justin Credabel MACNA presentation recommending 2 to 3 x potassium levels. He claims it gives him faster growth & better colouring.
He basses this on potassium being a necessary fertilizing element for photosynthesis along with phosphate & nitrogen, & since levels of phosphate & nitrogen are typically higher in aquaria than NSW, higher levels of potassium levels thing out.

In regards to 300ppm calcium, its recommended to keep it at 380 to 420ppm when keeping stoney corals. In a fish only tank it doesn't matter.
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Re: Calcium level

Postby saltydog » Sat 21 Jul, 2018 8:36 pm

TbyZ wrote:In regards to 300ppm calcium, its recommended to keep it at 380 to 420ppm

Well there have been a couple tanks over the years that ran around 300 - 350 Ca with growth rates just as fast as any other tank (sps types). Than there are those who say they had serious TN problems when calcium dropped below 350.
So why is that? :-s

TbyZ wrote:I've recently come across a Justin Credabel MACNA presentation recommending 2 to 3 x potassium levels. He claims it gives him faster growth & better colouring.

Sure, but I would like to see some actual time line photo's of that growth rate. Because I see this claim all the time, but actual growth is usually ultimately no faster than another type of tank that has good growth but adds nothing.
So again, why does someone gets faster growth in their system adding x3 potassium but ultimately no faster than another system that dosen't supplement potassium at all? is the most important question?


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Re: Calcium level

Postby TbyZ » Sun 22 Jul, 2018 10:26 am

saltydog wrote:Well there have been a couple tanks over the years that ran around 300 - 350 Ca with growth rates just as fast as any other tank (sps types). Than there are those who say they had serious TN problems when calcium dropped below 350.
So why is that? :-s


Was it the low calcium ?
TN commonly occurs when high alk levels - high light levels are maintained with low inorganic nutrient levels. Its regularly suggested to run lower alk if you run ULN systems.
Dana Riddle believes the reason for TN in this situation is "unnaturally high alkalinity levels turbocharge photosynthesis and production of harmful oxygen species, and natural enzyme defenses are overwhelmed, thus tissue is destroyed. This happens at the tips of SPS corals because a.) the tips receive the most light and b.) the tips are likely exposed to the most water flow (which also boosts photosynthesis.)"

There's a lot of unknowns with keeping coral.
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