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A friend recently cleaned and changed all filters, did a 50-75% water change and also removed and cleaned all ornamental rocks in a tank......at the same time. Now the tank is cloudy. Could this be a bloom? I offered used filter media from an established filter. Would this help clear tank or just let it run its course. Not my tank so I do not have any of the tested numbers. Just trying to trouble shoot.
 

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Could be a bacterial bloom especially since he/she did everything at once. Cycled used filter media may be helpful depending on the amount of media and the bio-load difference between the 2 tanks.

Obviously testing results would be helpful as it is possible an ammonia spike could happen.
 
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