i am located about 60 miles north of Pittsburgh.......my system consists of 250 watt radium MH and 39 watt T5's.....calcium around 400-450, alk 9-10,salinity 1.027,temp 79 and everything kept in check with a calium reactor....these chalices are kept on the bottom about 30" under the lights......and sorry i do not wanna frag these 2 chalices because they are show size colony's