You need to slowly tune the water level in the skimmer. Lowering the level is likely to give thicker and dryer skimmate like kopi-o. Sometimes the skimmate is thin due to low dissolved organic level in the tank.
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A fishtank is just like your computer. When your tank crash(OS crash), its time to cleanup(reformat hard drive) and setup(install OS) again and add new livestock(re-install software).
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