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Your fish are stressed and potentially malnourished. Consider using a vitamin supplement such as Vitachem or Selcon. What are you feeding these fish? These fish should be fed Mysis, Formula one, Formula two and the like regularly.
What are your water parameters exactly (salt, ammonia, nitrate, nitrite, temp etc.)?
What type of filtration do you utilize?
You mention chlorine but I am unclear as to what you're talking about. Please be more clear. Looking at the above (i.e., food, water quality, filtration) usually provides the answer to problems such as the ones you describe.
Best,
Rick
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