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kotlec

reasons to dye. Help and ideas needed

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mcarroll
4 hours ago, kotlec said:

 Are you saying that being in more calm conditions can be harmful  ?

  My head goes round.

Look up the coral boundary layer...should help cement the issues:  https://www.google.com/search?q=coral+boundary+layer

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kotlec

I honestly thing that none of corals are in a such low current that boundary layer problem can occur at all.

I can make video for more corals swaying  if that can help ?

Since my attempt in increasing Po4  my montipora fire digitata doubled in polyp size. Also hammer that has open mouth have shut up. I thing those are good signs that we are moving right direction.  2 of 3 scrubber screens are still in place.  In few days I am planning to test for PO4 again and decide how to proceed.

Yesterday Testing did not show any difference though seems like corals are reacting to some extent.

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mcarroll
4 hours ago, kotlec said:

I honestly thing that none of corals are in a such low current that boundary layer problem can occur at all.

It's a situation of gradients, not a checkbox unfortunately.  

 

For example, if the bulk tank water has a high phosphate concentration, then even a small amount of boundary layer penetration may be perfectly adequate.  But under low-phosphate conditions, it could take a lot more exchange with the outside water (ie higher flow) to satisfy the same phosphate need.

 

Permutations are endless and corals, generally speaking, are very adaptable feeders, but like anything else they aren't without limits.  

 

So a specific PO4 level that might be fine for a coral in high flow, might potentially be too little for the same type of coral in medium- or low-flow.

 

Relative light levels might play a role in these differences too.

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kotlec

Ok. Now I get it.  Thanks for explanation.

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kotlec

Reporting on situation for those who follow.

After increasing nutrient level  most of corals responded positively. Especially LPS corals look more inflated and bit brighter in color. 

Staghorn acropora lost some coloration and I see less polyps though.  

 

Phosphates are at 0,04 and nitrates 5  now. Not sure if I want to increase nutrients more as acroporas started to react negatively.

Reporting on situation for those who follow.

After increasing nutrient level  most of corals responded positively. Especially LPS corals look more inflated and bit brighter in color. 

Staghorn acropora lost some coloration and I see less polyps though.  

 

Phosphates are at 0,04 and nitrates 5  now. Not sure if I want to increase nutrients more as acroporas started to react negatively.

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