Charles:
Appreciate your insight to this clam condition. However, I am also experiencing problems with my SPS colonies after losing 11 of my clams over the last 4 weeks. The last loss was just yesterday. The clams did display a white stringy mucus from the exhalent syphon. These clams had not been in any type of antibiotic treatment. Once the white stringy mucus was noticed, the clams went downhill and died.
In regards to the SPS's, since the time the clams showed signs of sickness, SPS colonies slowly started showing a reduction in polyp extension. Out of at least 50 colonies, there is no polyp extension. This started with montiporas and then moved to the acros. All colonies and frags in my growout sump, with less lighting, all have polyp extension. Is there a possibility that these colonies are being affected by a bacteria (preliminary toxicology report for clams points to flavo bacteria) that is sensitive to intense lighting?
Note: I have done several water changes over the time the clams have been removed from the tank to assure good water quality. Water quality has remained good, however, lettuce slugs, which have been kept healthy for several months, have shrunk and are turning orange. It is very obvious that there is a problem with the tank.
Charles, one last question regarding antibiotic use. I have been very hesitant in its use in the tank. After reading your post I'm re-thinking my use of them. Do you think they would be beneficial at this time with the shape my SPS's are in. I have one derasa left in the tank that I'm sure is infected but shows no signs of illness...yet. However, I know the infection is in my tank.
Slojmn & SueT:
I'm sorry to hear about your losses
Scott