They are bad about not doing PWC.
But recently since this happend they have been doing them more frequently.
Hmm...this could be an issue. Not doing any for a while, than doig a whole bunch, especially if they are very good water changes(meaning, the gravel gets vaccumed and alot of water taken out).
Ask them if, when they did a water change right before it got cloudy, they did a huge water change. They could have cut down on alot of the nutrients in the tank, and not leave enough to catch up with the with the waste production of your fish.
Also, ask them to test their water and see what the levels are.
Ammonia, nitrite, nitrate, pH, etc.
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