i know this subject has been done to death but it seems that my 4 month old nanostreams are suffering the same faults as the first ones-tunze hasn't fixed the problem,both mine run fine apart from every 6 weeks the clamps break and the nubs on the back break off,this happens by itself in that the pumps just fall off the glass with the clamp in 2 pieces-the clamps have been replaced twice and im waiting for two at the moment but unless tunze get serious about fixing the problem their getting binned ,im not so much worried about the pumps or the money but the downtime is unacceptable as is the risk to the livestock. i know from reading this forum that tunze usa are good about warranty as is australia the big problem here is we have to wait months for parts -again unacceptable