Ralf, I didn't know we could order directly from Grotech! I was planning on ordering my TECH III from Aquarium & Pond products from SeaMe.com - For hobbyist & professional - Only the best is good enough
I couldn't find those bumps here in the US either
FYI.. I just sent an email to AquariumObsessed (only USA distributor ) and DarkLordCoral.
Seems that they don't (Grotech) :-(
I was misleaded by their english menu in the onlineshop, but even the term&condition page behind the engl. menuentry is german .
Ralf