IF you are gravel vaccuming which is removing food/wastes/bacteria and the bacteria on decorations and the glass that gets exposed to air during the waterchange that bacteria is lost or killed.
IF your filtration is well seeded for the fish and waste load then you could waterchange 100% daily and not have a problem.
I dont know how long the filtration with the amount of fish currently in the tank has been setup and going. If its been more than a month than all the filters should be well seeded and good to go as long as the feeding rate and the amount fish has not changed.
Otherwise, lack of fine filtration or the water quality coming from his tap is not so good.
How is the water on your other aquariums? If that is good, than its not water source.
How well, did you rinse the pool filter sand before putting it in the tank? sometimes those fines never settle unless it is filtered out.
Just trying to give some ideas here before one goes to a chemical method.
IF your filtration is well seeded for the fish and waste load then you could waterchange 100% daily and not have a problem.
I dont know how long the filtration with the amount of fish currently in the tank has been setup and going. If its been more than a month than all the filters should be well seeded and good to go as long as the feeding rate and the amount fish has not changed.
Otherwise, lack of fine filtration or the water quality coming from his tap is not so good.
How is the water on your other aquariums? If that is good, than its not water source.
How well, did you rinse the pool filter sand before putting it in the tank? sometimes those fines never settle unless it is filtered out.
Just trying to give some ideas here before one goes to a chemical method.
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