Some Corals Bleaching

[nemokeeper]

Hello.... my 60 gallon cube tank has been running about a year now. I was just wondering what would cause my blue polyp monti cap to bleach? Its been in there for awhile and one day is just started to bleach. I did notice it start to bleach alittle when i installed my kalk reactor but all my other acros are not effected... any ideas?

 

[snorvich]

Alkalinity stability is essential. What are your water parameters?

 

[nemokeeper]

ammonia - 0
nitrate - 0
ph - 8.4
dkh - 9
cal - 450

 

[nemokeeper]

anyone have any ideas?

 

[Peef]

Mine have does this before as well...mainly when I have "stressed" them with water changes or any unexpected dosing...as long as it doesn't continually spread they will recover...at least mine did!

 

[nemokeeper]

how long did the recovery process take?

 

[JMartin104]

I did not see a mg reading but this caused me great problems in the past. Is the whole thing bleaching or just the tips/edges?