from Borneman's Aquarium Corals:
Quote:
Causes of Bleaching:
bacteria
chemicals
ciliates
coccideans
darkness
fungi
heavy metals
higher temperature
hypersalinity
hyposalinity
lack of water movement
light
medications
noxious agents
physical stress
red spectral light
sedimentation
starvation
stress
temperature change
UV radiation (suddenly increased or prolonged)
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how's your temp?