oh i just Have to post this on this subject lol....
--1: after putting in a fairly spendy Pergo wood laminate floor, i installed my wife's 40 gallon corner tank. all was well untill the Anemone she HAD to have for her picassos decided to park up on the return. i honestly put it all in from the other tank, went to my mother's to help her, and in 4 hours i flooded my floor. now it just wasnt the 30-ought gallons from the sump, BUT all the water level from my 180 that back-drained as well. guessing about 50-55 gallons lol. New, New floor and never EVER getting another nem.!
--2: i, instead of spending the money for a larger mag drive/return pump, decided to couple my mag9.5 And mag7 together. well it worked fine until the shaft sheared on the 9.5 (from running backwards uknowingly) after a week of not really thinking about why things just Sounded louder, i got shocked petty bad because the magnet had bored a hole in the housing exposing the coil fed by 120volts! lol