I have no clue as I never had one, but if it doesnt work take it back and get a new one, if you have the same problem (hopefully not) you know not to invest your money in that product ever again! =) Good luck

ok thanx, does anybody else kno whats wrong?

nevermind i got it working

Cool! What was wrong with it? Maybe someone else will need this info sometime in the future, ya never know! =)

Cool! What was wrong with it? Maybe someone else will need this info sometime in the future, ya never know! =)

The amount of fog produced depends on the depth of the water. If the water is too deep you won't get any fog.

I also have a exo terra waterfall and fogger the previous poster mikedahms is correct if the water is to deep you wont get any fog and if it sits to high it wont turn on... also the filter and pump it comes with that you get is horrbile. I had to make all kinds of custom modifications to mine to make it work ill post a pic of my setup for you in the gallery =)

what kind of modifications?