Algae Scrubber Disaster

[Jaws]

Everytime I clean my algae scrubber, it crashes my tank. WTF!!!!!! I always have to perform an immediate water change afterwards. I've lost an Achilles, two Bartlett anthias, and a sharknose goby already. I don't get it. It's growing algae like crazy. When I remove it, a small amount of the water thats absorbed into the algae gets squeezed out but if that's enough to crash a tank then these things are more dangerous than good.