I've asked about this wave marker and my trusted source informed me it is definitely reliable ! He told me they are using it in their frags tanks since it really kicks and it's cheap... I think I will order this set next week! However, there is one thing I'm worried a bit about: the fact that I've got 75 gal, and this monster is supposed to deliver more than 2000lph at small-wave setting ... Isn't it too much ?! Cheers!