So i read the directions again they are a very bad english translation its sort of funny! It lists everyhthing in Centimeters so i converted it and aparently bulkreefsuppy has the hight for water listed wrong.. they have like 9.5 to 11 so i placed it with water height was 10.25 if you convert the centimeters listed on the directions that came with it the max height is 10.25. i cut four 2" spacers from pvc and placed them under the skimmer yesterday around 4 wolk up this morning and the skimmer has about 3/4 of a inch of nasty brown water. and the bubbles at the top are starting to get thick and nasty looking..