tridacna bleaching

MermaidDreamer

New member
Hello!
We have a major problem. I have two tridacna clams in my tank...one is maxima ( 1 year old, she is fine), other one is derasa ( 6 month in tank) and she started to bleach two months ago.
Can anybody know why?
They are on same position.
The tissue is alive, but the loss of zooxanthellae makes the it look transparent in affected area.
Aquarium parametars are stabile and other similar inhabitants are just fine.
Thanks for any input.
 
hello


phosphate 0.2
Ca 410
ph 8.0-8.2

Tank is 150 gal, lightnig are 4x54 W (10000K) and 4x54 W (20000K)

119999tridacna-.jpg
 
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