My frag seems to be mounted upside down as well. Looks like it is right about 10mm(1cm). Its in a 30 gallon cube 18x18x18, Viper 150w w/phoenix14k bulb(who knows how old), Simple rubber made sump(no chambers), 40lbs live rock in the display 10 or so pounds in the sump, unknown skimmer, eco plus 633 return, korallia 1050 power head. No dosing just 5 gallon water changes every three days. Not sure how long this frag is going to last for me. It has signs of covering the cut portion with skin but no polyp extension. Frag is placed high up with pretty heavy flow.