Thin table acro tips covered with brown dirt

[Admiraltian]

I have this thin tabling acro covered in dirt like sticky particles. Everytime I turkey blasted it away, there will be some residuals still remained on the tips areas which is also hard to totally brush away. After a day it will grow or accumulate the same amount of dirt back in the same tips area the next day. Any bros or sis has any remedy for this problem?

Pic of the problematic acro as reference.

[acs]

KH issues. Adjust it to norm and it should be fine .

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[hansolo]

Is this kh too high or too low?

[sgtayc]

I also have this problem. Looks like those branches are dying and being attack by algae. Sometimes brown stuff with small bubble right?

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[JMW]

My valida is having this too, trying to snip off the edges which have algae to make it grow out!

not too sure if it is tips burn typically caused by high KH?

[Admiraltian]

My KH is on the low side but stable ard 7-7.3dkh. Will montior further, the rest of my sps r doing ok.

[Admiraltian]

The brown stains are gone & my affected sps r slowly recovering & gaining bk it's colors after water has stabilized. So I concluded it probably due to some parameters or elements out of range. My mg kinda low and I might hv overdose on stuff  like amino acids and traces.

[patricklhc]

This is what some call "burn tip" usually causes by kh swing or change of LED light setting to stronger or if u have move your corals from lower light area to high light area

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[mrbryan12]

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[Zicoliko]

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